I did Camp America/CC USA for seven summers between 1994 and 2002 (with a few summers travelling elsewhere). I worked in the kitchens in a camp in North Carolina, not too far from the Tennessee state border. I had an absolute blast, met my wife there, made friends that I'm still in regular contact with and did loads of travelling.
Originally I was going to go with a mate as well, but due to circumstances went on my own in my first year. Looking back, I'm really glad I did as in those days (1994) there wasn't nearly as many International staff as in later years. This give me an opportunity to befriend a fair few American counsellors. This turned out to be a good thing. They have cars. They will lend you their cars on days off!
If your under 21 and you like a bevvy, maybe it might not be for you? Back when I was there, ALL the bars, clubs, places that sold booze, etc would ask for ID. If you didn't have suitable ID (passport or International Drivers License), you didn't get served, simple as that. It might have changed since I was last there, but i somehow doubt it.
That aside, I couldn't recommend it highly enough. I'm living in Australia now, I doubt I'd be here if I hadn't done Camp America and developed the travel bug. Get out there and do it!