Old Rag is a fairly unique hike for the area. The upper part of the hike is an exposed rock scramble with good views. The hike, in total, is long enough to be challenging, but not really technical or dangerous. And it's close enough to DC (<2 hours) that weekends were a madhouse, especially during COVID.

The remained of the park, and all the surrounding areas, are first-come, either free or with minimal permit/entrance fees.