good campground around Baltimore, MD

Patapsco State Park Hollofield is actually a great park. Its only about 20 miles from us so we normally stay there once a season when the kids have sports going on so we can still take them to their games. Close to the Baltimore Beltway. Underutilized. Campground is way back from the park itself. Nice (but steep) hiking down to the Patapsco River. Nice fairly secluded sites. You would have no idea you are so close to the city.