Josh,
If you let us come and mud it up on the bombing range I.. er, we would looove that. I'd be all turning my wheels, pretending to dodge the impacts, AAAAAAAAAAAAaaaaaaaaaahhhhhhhhhhhhhhhhhh!!!!

seriously, there is Uwharrie National Forest in Troy, NC (very cool place) its about a 2.5 hour drive from the Raleigh area. There are also a couple of places in the mountains that are cool. Those are a sample of the legal ones.