A really fun thing to do is to make an obstacle course. First, it'd be something simple, a small maze with a tiger in it. Then the exit would lead to another exhibit, an entire saltwater exhibit with plesiosauruses, then a forest full of velociraptors, then, the final stage. A massive exhibit filled with restrooms, bouncy rides, and other buildings with a rampaging T. Rex.
The fun would begin when I'd put a adult male guest at the beginning. He'd have to get to the end of the maze without getting killed by the tiger, swim through the lake without getting killed by the plesiosaurus, through the forest with the pack of velociraptors, and through the rampaging T. Rex. Will he survive? Who knows.