Great ride with the D.C. T.E. gals - and my DH.
As DivingBiker noted, a bunch of us rode Rosaryville State Park for a sweet singletrack fix on Independence Day. With a few extra spurs, I got in a hair over 11 miles.
DH left our group when he hooked up with friends and discovered a whole new section of the park - definitely the "R" rated section to our "G" - well, perhaps PG-13 - ride!
Check out our route at: http://www.bikely.com/maps/bike-path/Rosaryville-SP