lifetime pass

"Claiming your voucher is simple, but quantities are limited. Download the voucher on or before Oct. 8, 2015 to get access to over 400 national parks for free. Redeem your lifetime park access voucher on Senior Skip Day, Oct. 8, 2015 when you visit one of these participating National Park Service sites." http://humanaseniorskipday.com/Home/VoucherRegistration