Waterville USA is a pretty neat little place. As you might have guessed from the name it is mostly a water park, but it also has an arcade, mini-golf, go-karts, kiddie rides and a wooden coaster. We didn't visit the park until almost dark and by that time most of the attractions were closed, but I did manage to get a handful of photos of their solid coaster offering - Cannonball Run.
I wish I could give more of an idea of what Waterville USA is like, but we just weren't there when everything was in operation. From what we did see, the staff is very friendly, the arcade has a decent selection of games and the coaster is certainly worth a ride. Definitely worth a stop if you're in the Gulf Shores or Orange Beach area.