Just half an hour Southwest of DC is a 218 acre lake surrounded by wilderness. Because there are no homes on the lake and gas-powered boats are not permitted, the park feels like it could be far off in the mountains.
Entrance to the park is $10 (free for Fairfax County residents), and there are additional fees for activities such as golfing, canoe rental, or riding the narrow-gauge train that goes along the western shore of the lake.
Camping is also available on the lake’s north shore, though it can feel a little cramped with all the cars in these drive-in sites.
A 4.7 mile trail winds around the lake and is suitable for hiking (2 hours with kids) or biking (half an hour).