Adventures are some of the most
boring AMAZING things you can find in Animal Jam. Usually involving you walking to somewhere, talk to some person, collect some stupid animals who are trapped by the Phantoms (while they can just shock you), rinse and repeat.
Usually, Adventures are part of a story involving Greely or something I don't follow-up on that info, THANK YOU VERY MUCH.
For competing adventures (and sometimes they take 30 minutes - a hour mind you), You get some weird Den/Clothing Item that doesn't matter in the real game. Because you know, gotta collect them fox hats.