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. There is an additional 3 mile option for those who want to do Trail B. Others can walk the tow path back to the car. The Billy Goat Trail is very scenic with views of the Potomac River to include rapids.