In celebration of National Park Week, admission fees have been waived at all National Parks on April 17-25! You've been wanting to explore Everglades National Park or learn more about the history of the Castillo de San Marcos in St. Augustine, so now is your chance! Also, there's a special offer for those travelling to Dry Tortugas National Park on the Yankee Freedom II Ferry -- those folks will be eligible to win two more passes for another visit. Nifty!
Ready to go? Here's a "Find A Park" tool on the National Park Service website. Have fun!