There is fishing, hiking, canoeing, kayaking, and paddle boating. If it is warm enough there is rafting and tubing.
I've gone here for July 4th a few times. Nick has been with me a couple of times. Its a lot of fun especially for kids to look at all the fish. They do fishing here, just catch and release.
I use to go there all the time when i was in middle school. It is so much fun, well it was when i lived in Mabank. It is about 35 minutes from the wedding location, its on the other side of the lake.