http://www.allsportsgp.com/corp.htm
All Sports Grand Prix, Dulles, VA
(Never been, just found googling...)
Crofton Go-Kart Raceway - more info »
1050 State Route 3 S, Gambrills, MD
(410) 721-2900
I've never been to these either. I do know Bladensberg is not a very nice area but is the closest to DC. The Dulles one is second closest and Gambrills farthest.
Aha, thanks. A friend went there with her office, I think. At least, I see the company name on the web site. I'll ask her for her opinions, and for those of her co-workers. Thanks.