Those not yet able to purchase the GAP can still benefit by purchasing an annual pass at a park they often visit.
Great Falls Annual Pass - $35.00
Valid for one full year from the month of purchase. Permits access to Great Falls Park, Virginia and the Great Falls area of the Chesapeake and Ohio Canal National Historical Park on the Maryland side of the Potomac River. The annual pass allows entrance for the pass holder and additional passengers in a single private non-commercial vehicle, or pass holder plus three adults when entering on foot or bicycle.
BUT, do everyone a favor and purchase on-line, or purchase on-site during slack times. There's nothing more frustrating than having your already purchased pass access and having to wait and wait and wait while others complete their paperwork in looooooong lines of cars ahead of yours.
Jim S