Camp Snyder is the local Cub camp, but it's built out really well and can accomodate multiple styles of Scout groups. They have tent camping like any regular summer camp, but they also have cabins available with bunks and full facilities if your group wants to go that route. Here's the link for more info on Snyder...http://www.boyscouts-ncac.org/openroste ... rgkey=1933
You might want to look into Prince William Forest down in Dale City, VA. They have great cabins, may also be able to provide tent sites, and have one of the best orienteering courses in the area.
If you give me a mileage radius you're looking to stay within and how primitive you want to get, I can give you more ideas.