Cherry Hill is a pretty cool place. Not very far from the Metro which brings you RIGHT into the heart of DC. The RV park has a large store, very nice pools, a small but adequate breakfast bar/lunch bar near the pool, some sites with nice outdoor furniture and paver patios, etc. Probably the most unique thing, in my view, is the on-site 'bus stop' for public transit and Washington DC tour buses. Very very convenient. Tickets for tours and such can actually be purchased on site in the store as well. Very short local drive to some nice stores and restaurants (and an RV repair/store, too)
Of course, when the time comes the locals (hey Holly/John, Tom, etc) will undoubtedly let everyone know how to get into and out of the area without going -through- DC.
- Mike