My dad owns a lot in a campground in Crossville. I haven't been there since I was a kid, but there used to be a huge flea market. I don't know if it's still there, though.
Chattanooga would be a great side-trip. There's the Tennessee Aquarium, the zoo, tons of hiking, bicycling (check out the RiverPark), the Hunter Art Museum, Rock City, Ruby Falls, the Incline .... just to name a few.
