Any tracks open to the public in Midatlantic/DC metro region?

[jnix]

Once I get through the break-in period, I'd love to get out on a track for a few laps and give my G35S a workout. Anybody in the DC/NoVA area know of a place I can do that without blue lights in the rearview? Ideally I'd like to get off the road and do it legal.

Also, if anyone has a favorite joyride loop in this area, I'd be interested in that too. I used to loop through Rock Creek park. Great for pushing the suspension and cornering fast, but not safe for real high speed stuff.