If you not already owning the Personal Terminal for your C.A.M.P., then you:

go to
-->Atomic Shop -->C.A.M.P -->Utility --> unlock the "My Personal Terminal" for free
Then go to your C.A.M.P and build the Terminal, which should be found under "Misc Structures".
After you built the Terminal, leave your building menu, use the Terminal and there you:

go to
-->[AUTOMATED ALERTS] -->[SUSPICIOUS PERSON]
-->[[DOWNLOAD COORDINATES - SUSPICIOUS PERSON]]

This will trigger a miscellaneous sidequest called "Investigate the suspicious person"
then you move to the shown map marker and collect all items as well as the Broken ProSnap Deluxe Camera from the dead body. If the marked dead body is empty, you have to switch server and try again.

Now you go to ANY Tinker's Bench and build the ProSnap Deluxe Camera what you should find in the "Camera" menu of the tinker's workbench.
You will need 3x Adhesive | 3x Aluminum | 2x Glass | 5x Silver | 3x Spring
The crafting of the camera should also automatically give you 20 camera film.

go to the shown position on the map and talk to the the Mr Handy named Scout Leader Jaggy.
This will start the Tadpole Questline The Order of the Tadpole. The first thing you do, is to finish the 3 tests for swimming, sports and mammalogist at the tadpole computer in the big house next to the tadpole leader jaggy. The possible questions/answers for those 3 tests are provided below.

Q: Billy is running around Wavy Willard's Water Park when the lifeguard blows a whistle and points at him. What should Billy do?
A: Immediately stop running to avoid slipping on a slick surface.

Q: It's a late night at summer camp and you can't sleep so you decide to go for a swim in the lake. As you leave, your swimming instructor angrily yells at you. What did you do wrong?
A: You forgot that swimming while it's dark outside is always a bad idea.

Q: Little Lizzie is scared of swimming in the local community pool. What aspect of swimming pools should she actually be concerned about?
A: The water is too deep for some non-swimmers.

Q: Steve the troublemaker is trying to trick people into thinking his made-up swimming stroke is real. What is the name of this obviously fake stroke?
A: Speed Stroke.

Q: Suzie is a beginner swimmer who is nervous about getting in the water. You teach her several techniques to stay afloat without an aid, which makes her feel better. Which is NOT one of those techniques?
A: Flailing.

Q: The impossible happens and the evil commies manage to launch a nuke on American soil! How does this impact your swimming routines?
A: All water sources are likely to be heavily irradiated, so swimming should be avoided.

Q: Timothy is bragging about all the health benefits he gets from being a regular swimmer. At what point in his tiresome prattle do you smugly stop and correct him?
A: The long-winded conclusion declaring the prevention of bacterial infections.

Q: What is the correct way to revive a drowning victim?
A: Turn the victim's head to the side to drain water, then back to the center for mouth-to-mouth resuscitation.

Q: What is the primary purpose of a swimming buddy?
A: To have someone that can alert the lifeguard in the case of an emergency.

Q: Which is the proper way to breathe while swimming?
A: Alternate between having your face in the water and rhythmically breathing between strokes.

Q: Which of the following is NOT an authorized aquatic Pioneer Scout activity?
A: Breath-holding competition.

Q: Which of the following is NOT one of the risks unique to swimming in open waters like lakes, rivers and oceans?
A: Limited visibility.

Q: Which of the following is best to consume before a swimming session in order to keep your energy up?
A: A light snack.

Q: You find yourself struggling against a river current after your canoe tips over! Which of the following is bad advice to follow in this situation?
A: Give up and drown.

Q: You see Billy struggling to stay afloat in the swimming pool. You want to help him but you just dried off! Which is NOT a non-swimming rescue technique?
A: Talk.

Q: You're assigned the task of inspecting all of the life jackets being handed out to your fellow scouts. Which is NOT something that you need to verify during the inspection?
A: The jackets are all the required shade of orange.

Q: You're in a fishing vessel off the coast when the boat capsizes! You remember the words of your Pioneer Scout swim instructor and start to survival float! What are you doing?
A: Face-down in the water with hands out and palms down, lifting your head to take deep breaths.

Q: You're vacationing at Summersville Lake and decide to dive into the water - what fun! But wait - how deep did the swimming instructor say the water should be before attempting a dive?
A: A minimum of 7 feet-deep should keep you safe!

Q: Your friend Marie asks for a stick of gum before her swim. How do you respond?
A: Refuse to give her one, as chewing gum while swimming is a dangerous choking hazard.

Q: Your strange friend Miguel is a major hypochondriac, and has given you a giant list of health concerns he has with swimming. Which item on his list can you say he definitely shouldn't worry about?
A: Xerophobia.

Q: Alfonso is interested in football. He's a tall natural leader with a strong arm, and he knows every play in the book. What position would be best for Alfonso?
A: Quarterback.

Q: As a cross country runner, you might be called a "harrier". What is a harrier?
A: A dog.

Q: Barry is a strong baseball player who hits lots of home runs. What's the highest number of runs Barry can score on a single home run?
A: 4.

Q: Before a friendly kickball match, Samuel offers you a suspicious looking pill that you think may be Buffout. How do you respond?
A: Refuse and report him to the Scoutmaster.

Q: Brendan is a fast runner. Really fast! He might even run in the Olympics someday. Which sprinting event should he NOT train for if he wants to run an Olympic event?
A: 10000 meter dash.

Q: Hannah is training for a pentathlon, an event used to prepare athletes for the rigors of warfare. How many sports will she need to train for in order to compete?
A: 5.

Q: James wants to join the Army and fight the Reds, but he's out of shape. Eventually, he'll have to pass the Army's physical fitness test, which could be hard for him. Which of the following does he NOT he have to worry about being in the test?
A: Pull-ups.

Q: Like to throw things? Who doesn't! In fact, there's probably a sport for throwing your favorite object. Which of these is thrown for sport?
A: Javelin.

Q: Mark's favorite athletic event is wrestling. He idolizes famous wrestlers and wants to wrestle just like them. Which of these US Presidents has a reputation as a wrestler?
A: Abraham Lincoln.

Q: Most athletes bulk up by lifting weights, but weightlifting itself is a competition as well! Only a few lifts are used in Olympic weightlifting, however. Which of these lifts is no longer used?
A: The clean and jerk.

Q: Ricky loves riding his bicycle. He rides so much, he could probably compete in a Grand Tour! But there are a lot of stages to each Grand Tour event. How many?
A: 21.

Q: Susie is taking part in a long jump competition. She takes a running start, but stumbles at the last minute and only makes it three feet! How embarrassing, when the longest long jumpers can jump how far?
A: 29 feet.

Q: The "shot put" event uses a heavy sphere called a "shot". What do you do to the "shot" in this event?
Q: Put it.

Q: You're competing in a track and field race and have lined up at the starting line. An official will signal to begin. How does he do this?
A: Firing a starting gun.

Q: You're entering a marathon for charity and are set to run on the streets of Charleston. How far will you be running?
A: 26.219 miles.

Q: You're going rock climbing with Mary, when she slips and begins to fall! Luckily, she's brought to a stop by a device attached to her rope. What is this device called?
A: A belay device.

Q: You're on first base in a baseball game and decide to steal second base. How far do you have to run to get there?
A: 90 feet.

Q: You're playing ice hockey, and after checking a star player into the boards you're approached by a menacing figure who picks a fight with you. What is the name of this person's unofficial role on a hockey team?
A: Enforcer.

Q: You're training for a marathon, and decide to push yourself to see how long you can run. Despite your best efforts, you can only go so far. What substance builds up in your muscles and causes this?
A: Lactic acid.

Q: You've been running laps around the Charleston capitol building for exercise and have noticed that after running long enough you start to feel really good. What is this sensation called?
A: Runner's high.

Q: Alfonso is afraid of bats. They can get so big! How long is the wingspan on the largest bats?
A: 5'7.

QAustralia is home to a class of mammals called marsupials. What's special about most marsupials that's different from other mammals?
A: They raise young in a pouch.

Q: Brendan likes to sleep. A lot. He even sleeps in class! Which of these mammals is also known for sleeping a lot in the winter?
A: Bears.

Q: Erin loves canines, especially large ones! Which of these does she love the most?
A: Wolves.

Q: George would rather study dinosaurs than mammals because they're big and scary. But mammals can get big and scary, too. And they're still around! What is the largest living mammal? A: Blue whale.

Q: Hannah is from Alaska, and says that an iconic Alaskan mammal is actually a type of deer! Which mammal?
A: Moose.

Q: Hao is teaching her friends about Chinese mythology. She says that in folklore the spirits of mistreated animals can become demons. What are they called?
A: Yao guai.

Q: Humans are mammals, too! What is something that makes you different from a chimpanzee? A: I stand up straight.

Q: Mammals are broken into over twenty "orders". Which of these orders has the most mammals in it?
A: Rodents.

Q: Most mammals have babies the same way as humans. But one mammal actually lays eggs! Which mammal?
A: Echidna.

Q: Samuel was out in the woods when he drew a big bear's attention! He played dead until it went away. Which of these mammals did he emulate?
A: Opossum.

Q: Sloths are slow moving mammals that live in trees. Millions of years ago, though, there were huge sloths that lived on the ground! How big did these "megasloths" get?
A: All of the above.

Q: Snippers is a good house cat. He eats his food and uses his litter box, just like he's supposed to. Which ancient country can we thank for domesticating cats like Snippers?
A: Egypt.

Q: Spot is a hunting dog. He likes to hunt bunnies and birds. What do African wild dogs like to hunt?
A: Antelopes.

Q: Susie lives near the Emmett Mountain Disposal Site and has a pet naked mole-rat named Jiffy. Why is Jiffy a good pet to have in this location?
A: He's cancer resistant.

Q: Susie wants to run really fast like her favorite mammal, so she practices running laps every day! Which mammal is the fastest on land?
A: Cheetahs.

Q: The mammary glands of female mammals produces which liquid after giving birth to their young?
A: Milk.

Q: West Virginia cattle are good eating, and the cattle love to eat, too! In fact, their stomachs have several compartments. How many?
A: 4.

Q: What walks on four legs in the morning, two legs in the afternoon, three legs in the evening, and no legs at night?
A: A human.

Q: Which of these traits is different in mammals than in reptiles?
A: They have hair.

Q: You and Mary were both given pet rabbits as Christmas gifts. Mary's rabbit is a girl, called a "doe". Yours is a boy. What are boy rabbits called?
A: Bucks.

Q: You're hiking in the woods near your house and spot a red fox. Red foxes are native to North America. Which of these continents are they not native to?
A: Australia.

Go to the shown Areas, finish the Quests for Pioneer Scout Leader Pompy and Pioneer Scout Leader Treadly. The Quests are self explaining and have their own Questmarkers and Questareas, which you might follow to finish them quickly.

Wavy Willard's Water Park
.

Fotograph those three:
Crocolossus
.
SlitherSlide
.
WavyWaves

go to these shown locations and finish the running parcour in New River Gorge Bridge, Sunnytop Ski Lanes and in Camp Venture.
.

New River Gorge Bridge - Tadpole Parcour:
.

Sunnytop Ski Lanes - Tadpole Parcour:
.

Camp Venture - Tadpole Parcour:

Finish the Swimming test at Spruce Knob Lake, wearing a swim suit. After starting the Quest, you will be pointed to a stash with swimsuit.

.
Swimming parcour start:

you have to find 10 milkable brahmin and milk them. Dont forget to also photograph one of them!
If you didnt got enough brahmin to milk, switch servers and try again.

You have to photograph Brahmin, Cat, Fox, Opossum, Rabbit, Radstag, Squirrel, Wolf and YaoGuai.

If you didnt already get it automatically, then you might have to respec your SPECIAL to 5 Strenght and/or to 5 Agility. Use a punchcard machine either from your C.A.M.P. or from any Train Station on the map. You have to be at least level 25 to be able to use the punchcard machine.

Punchcard Machine

For the "Revive Player in Water" Challenge i recommend, to take your secondary C.A.M.P. Slot and build a foundation next to a lake and up to 4 ladders, like shown on the picture. Then you ask a friend to climb up there and let himself fall down. During falling down he should aim to shallow water, so you can emmediately revive him with a stimpak. If he wouldnt die, he has to highly radiate himself to lower his maximum HP. He also should remove Serendipity skill card, if equipped.

.
Alternatively, you can go to Charleston to the Summersville Dam, where is a hanging bridge and a small River. Let your friend jump down from the bridge there.
.
During falling down he should aim to shallow water, so you can emmediately revive him with a stimpak. If he wouldnt die, he has to highly radiate himself to lower his maximum HP. He also should remove Serendipity skill card, if equipped.
.

After you finished all of the above, you are tasked by the Quest itself, to talk to the MrHandy Scout Leader Jaggy. This will finish the Quest and give you the backpack as well as the ability to recraft it on an armor workbench.
You can and should also mod your packpack in several ways. The most important ones are 90% carryweight reduction either for chems or for food & drinks. I say this, because it gives you 3 more SPECIAL points to distibute, when you can remove either "traveling pharmacy" or "thru-hiker" skill cards.
source: https://fallout.fandom.com/wiki/Backpack_(Fallout_76)

you can get the mod-plans like this:

Plan: Chemist's backpack mod - Mortimer in Crater Core (350 Gold & Raider friendly reputation)
Plan: Grocer's Backpack Mod - Samuel in Foundation (350 Gold & Settlers friendly reputation)
Plan: Backpack armor plated mod - possum vending machine (5 badges)
Plan: Backpack high capacity mod - possum vending machine (8 badges)
Plan: Backpack insulated mod - possum vending machine (5 badges)
Plan: Backpack lead lined mod - possum vending machine (5 badges)
Plan: Backpack refrigerated mod - possum vending machine (8 badges)

The possum vending machine is in the pioneer scout camp, the Mr.Handy Mortimer is in Crater Core and Samuel is in Foundation.


Reputation Tiers:
source: https://fallout.fandom.com/wiki/Fallout_76_reputations

you can farm reputation by finishing the daily quests for settlers and raiders, as well as the new cooking mission Recipe for Success, where you can decide who to give your meal (stimpak added = settlers reputaion | psycho added = raiders reputaion).
Also Eviction Notice and Moonshine Jamboree give you a small amount of reputation.
There are several random encounters on the map, where you can farm small amounts of rep too.