I am low tech. No cell, i just looked at trailforks for the first time and i am sure locals have way more knowledge to offer. Any of these states will be nice with water and many trails like i described without lots of distance to get to the trails.Try looking at Trailforks, all kinds of places to go around here.
Also you should be more specific, VA,MD, DC and DE covers a large area.
I get this. Highways are in the valleys and mountains are often on both sides. That is why our regular wind is south/west. Just having a few names will allow me to hit the good spots instead of searching for them. When our fat season ends we wait a month for the trails to dry so i can drive south and ride.I agree with what Cotharyus said, but with a month to kill and a mobile base of operations, I'd start at one end of Va and work my way to the other along the I-81 corridor. There's great riding all along there and several rivers to choose from. You could easily spend a week + around Stokesville and not ride it all. The GWNF has abundant car camping opportunities.