More details on the free park admissions here. https://www.nps.gov/findapark/national-park-week.htm
National Park Week, April 16 to 24, 2016, is America's largest celebration of national heritage. It's about making great connections, exploring amazing places, discovering open spaces, enjoying affordable vacations, and enhancing America’s best idea—the national parks! It's all happening in your national parks.
National Park Week is the time to discover national parks and the wonders they contain. Find your park!NPS photo
The National Park Service is once again partnering with the National Park Foundation, the official charity of America's national parks, to present National Park Week, a presidentially proclaimed celebration of our national heritage.
Now's The Time!
Plan your visit by what you want to do or where you want to go. Here are some highlights during National Park Week:
National Park Week, April 16 to 24, 2016, is America's largest celebration of national heritage. It's about making great connections, exploring amazing places, discovering open spaces, enjoying affordable vacations, and enhancing America’s best idea—the national parks! It's all happening in your national parks.

The National Park Service is once again partnering with the National Park Foundation, the official charity of America's national parks, to present National Park Week, a presidentially proclaimed celebration of our national heritage.
Now's The Time!
Plan your visit by what you want to do or where you want to go. Here are some highlights during National Park Week:
- April 16–24: Visit for free!
Throughout National Park Week in 2016, every national park will give you free admission!