I used to live in MD. You're not going as many riding areas as you'll find where you live now. There are a lot of moto-x tracks, but trails are kina scarce.
Thare are some options, but you'll have to drive a bit. Definitely join southern MD dirt riders. They travel on a regular basis in a group, and have a monthly fun ride at Budd's Creek's national hare scramble course which is a blast. Budd's Creek is only about 1.5hrs south of Balt...
http://smdr.org/default.aspx
There is also Hatsfield-McCoy in WV(5hrs), Tower CIty in PA(2.5hrs), Savage River in western MD(2hrs, but small), and some other places up in PA...
Southern MD isn't that bad terrain wise...Lots of clay hills, and sandy bottoms. Watch out up in PA, and in WV....Those places have some areas will give an AA rider all they can handle!