What else is there to do in Nashville and surrounding areas?

Been here 3 years and Im not sure what else to do for fun with the kids. So far we have been to Gatlinburg/Pigeon Forge(4 times), Dollywood, parks around Nashville/Hendersonville/Gallatin/Millersville and the list goes on. Downtown Nashville is pretty annoying to walk around and not very kid friendly. Been to Opry Mills(want to end it everytime we go there). Chattanooga was ok just very touristy like everything else. Anyway I guess all of this to say moving here was a mistake.