Explore one of America’s 394 National Parks during National Park Week, which begins tomorrow, April 16, and runs through Sunday, April 24. To celebrate, the National Park Service is offering free admission at parks that typically charge an entry fee.

Headed to a National Park this week? We’ve highlighted a few of the special events taking place at parks across the country:

Guided Bicycle Tours
Stones River National Battlefield, Tennessee
April 16, 23

Scranton Limited Short Train Excursions
Steamtown National Historic Site, Pennsylvania
Starting April 17

Adventure Canoe Trip to Jones Lagoon
Biscayne National Park, Florida
April 16

Full Moon Hikes
Bryce Canyon National Park, Utah
April 16, 17

Celebrate John Muir’s Birthday
Muir Woods National Monument, California
April 21

Junior Ranger Day
Multiple Park Locations
April 23

Although it’s a fee-free week, consider donating to the National Park Foundation, which works to strengthen and preserve the nearly 84 million acres of land protected by the NPS.

Plus, don’t forget to send us your photos! We’ll be putting together a gallery of our favorites. Submit your photos (tagged #parkwk) to My Shot by May 1. In the meantime, browse these user photos of the ten most visited national parks–and get inspired to capture images of your own.

[U.S. National Park Guides]

Photo: Mark Genito/My Shot