Information on Cherry Hill Park:

Closest campground to DC (Open Year-Round)
9800 Cherry Hill Road
College Park, MD 20740
Office Hours: 7:30am-8:00pm
RV Sites  (prices for 2 people - $5 extra/guest)
Regular $77 hook-up site    one night
Premium $88/day Bath Site 2 people  $5 extra/guest    
No RV? No problem! Choose from tent sites, premium log cabins, glamping pods, cottages, rustic cabins, or the yurt!
Call for information on the availability of cabins and such
There are pictures and much information on their website: