Much of the old Action Park is still open as Mountain Creek, and much of it still makes one say "how do they get away with running this?" Cannonball slides, Tarzan swing, cliff jumps, etc., dropping you into freezing cold spring water... still there!
Not saying any of it is unsafe, as they have a pretty good track record now as Mountain Creek, but you can ride and do things there that you simply don't see anyplace else. Worth a trip if you like out-of-the-ordinary waterparks.