Directions from Baltimore: I95 South -> I495 (Silver Spring). Go around the beltway to Exit 41 West (R @ Clara Barton Pkwy) -> Left at MacArthur Blvd (@T) -> Park on the lot across from Anler's Inn or by the roadside. Parking on Angler's lot, you may get towed.
Hike about 6 miles total. Flat on tow path and rocky on Billy Goat Trail. Moderate Hike.