For anyone visiting several national parks –
National Parks Pass
$50.00 per pass
This non-transferable annual passport covers the entrance fees for all National Parks for one year from the last day of the month of purchase. It does not affect camping fees, concession facilities, user fees, such as cave tours, or cooperating association bookstores.
The National Parks Pass can be purchased three ways:
1) in any national park where an entrance fee is charged, and at participating park book stores operated by cooperating associations
2) online at http://www.nationalparks.org
3) by calling 1-888-GO-PARKS