Chris: I don't know if you already made your plans, but we just stayed at Greenbelt Campground in DC last week for 4 days. We found it to be a very nice, heavily wooded park with lots of wildlife and good safe asphalt roads for the kids to bike and scooter. There were hot showers and flush toilets and utility sinks for washing dishes. The park was not very crowded at all when we were there and most days we had a lot of privacy. The campground is 2 miles into the 1100 acre park, but the interstate entrance is just a block or two from the gate to the park. The prices can't be beat (only$8 with Golden Age Pass, and regular $16). Because of the wooded sites, it seemed 10 degrees cooler than in town and there was a breeze so we didn't need any AC, even though it was in the 90's. There is a ranger station at the entrance, and the park was patroled regularly. The village of Greenbelt is just a few blocks away and has free internet at the library and the town itself is worth a visit for the interesting history. It was an FDR WPA planned development community, one of 3 in the U.S. during the early 1930's, so it has an art deco theme. As mentioned, the downside is no electric hookups. We used our
battery power conservatively for the 4 days we were there, and had a very enjoyable stay.
Bigfoot
Casita
Check this web site: 
DesertHawk- Las Cruces, NM USA 
Google up the Virginia State Parks, you may have to settle for a bit longer ride but for under $25.00 w/water and elec, dump station. The transportation system in Washington is 2nd to none and you can catch them all around the perimeter of the city. One park that comes to mind is Shenandoah River State Park. Virginia is proud of their State Park system and it shows in all I've been in. Good Luck 
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