This handsome fella is sitting under a suspended boardwalk.
Go through the tunnel and head straight to the left.

This Charming coldblooder is chilling in a shipping Container.
ADVANCED HINT: He is hidden behind boxes to surprise you!
Right when you leave the train, inside the upper right shipping container.

This Handsome jumping enthusiast is enjoying some nice cave climate.
ADVANCED HINT: He's not behind a waterfall.
Go up the stairs and follow the path to the right. Behind the grafitti artists, there's a cave entrance. You might need a key to get inside though!
Go Through this cave. The Handsome Frog is at the other end of the cave to your left. (In the screenshot I turned around, I hope it's not confusing-)

If you're looking at the pool, don't hold your breath. Think outside of the Fence- eh, Box!
Go around the fence to the right. It should be pretty hard to miss him!

This Little dreamer likes watching volleyball matches from a high vantage point.
ADVANCED HINT: Wait, he may just be stuck on that roof.
Go to the Volleyball Arena. You have to get onto the roof on your side of the field! If you don't have the super jump yet, use the AC on that tree!

Thank you for using this Guide. I hope it helped you!

If you have any more questions, something is unclear or you have advice for improvements, Please comment below!
(I would also greatly appreciate ratings, just saying-)