Durhamtown is pretty cool, the owner and I are pretty good friends; however, I am personally a fan of Broadriver. Equidistant from Athens, they have tons of open and tight trails, fun 1 mile long MX Track, Mini Tracks, ATV MX track, great camping facilities etc. Durhamtown is too damn crowded for me. There is a pretty fun race series going on out there this summer since no one else is hosting a series. They're doing an Enduro series, MX series, and Mini Series.
Check them out: www.broadriveratv.com