I'm off Rt 610 (Exit 143 off I-95) in north stafford, just south of Quantico. I don't have a lot of great riding areas either. A couple of frinds with smallish trail networks on their properties, but that gets kinda old riding the same trail over and over. George Washington national forrest is about a 2hour drive for me, but has a pretty large selection of trails, with a good bit of technical rocky stuff:) Its all free and legal. If you want to go out their sometime I'm game. Your supposed to have a spark arrestor, but I've personally never been stoped or check for it (though I do have one on my bike).