As the name implies, the particular camp I attended was focused solely on Banjo, but other Nashcamp sessions cover (1) bluegrass and (2) songwriting. Check out their website at
www.nashcamp.com (I'm not a sponsor, but "a happy camper").
The camp instructors are all top notch, and bring their expertise to the total experience. For example, one of the regulars, Bill Evans, is a key educator and is the author of the book "Banjo for Dummies". Prior to attending the program, campers complete a "self-assessment" questionnaire which helps determine your experience level. The campers are separated into 4 levels. During the scope of the program, all camp groups had sessions with each of the instructors.
Sessions covered ranged from back-up techniques to individual playing styles (extremely cool to have "JD" in a session explaining and displaying his own playing style). Of course, there was plenty of time set aside (and most of the evenings) to jam with others. Parental (counselor) supervision was available, as were other musicians covering Bass, Guitar and Fiddle.
This year was my second time at Nashcamp, and I believe that you get the most out of it when you put the most into it. In other words, "pick up your ax and pick" when attending these types of workshops -- Active learning is the best way to go!