We went to Turner Falls this last weekend. Oklahoma's waterfall. It's a pretty and quaint spot in the Arbuckle Moutnains right outside of Davis, OK. If you are from Oklahoma and haven't been, you need to. It's not a might waterfall, but it is beautiful and peaceful in it's own way. There are also areas to camp, and caves to explore, as well as a meandering "castle" built by a professor in the 1930's that is now just walls and gates...
The site as a whole also hearkens back to a time when families explored interesting spots along highways, places for adventure, novelty, and beauty. It's a good place to visit.