See America the beautiful!  

This interagency pass allows entry for pass holder and 3 others (16 and older) to National Parks, US Forest Service, Bureau of Land Management, US Fish & Wildlife, and Bureau of Reclamation sites that charge a per person entry fee.  If the fee is collected per vehicle the is good for entry for one vehicle.  The winning bidder must contact the donor directly since the pass must be validated and it is not transferable.