My wife and I picked up our new 22FB last Saturday outside of Knoxville and headed for Tremont Campground in Townsend (http://www.tremontcamp.com/
) for our very first night camping in 30 years of marriage! We live in Nashville but grew up not far from Townsend, so it felt like we were 15 again, returning to where we spent many days playing in Little River. The campground is clean, quiet and secluded feeling. It is right at the National Park boundary and also close to a grocery store, hardware store and restaurants. The only slight bummer is the constant stream of folks tubing the river, thanks to the commercial tubing companies that have popped up in Townsend. We camped in Section B at a spot right above the river and the rapids below provided that heavenly sound of rushing water. There is a KOA nearby, but I don't know anything about it.
In the Nashville area, the only campground I am familiar with is Seven Points. We drove through it before we bought our camper and it looks really nice. It is well maintained and right on Percy Priest lake.