Every year, NPS celebrates their birthday by hosting special events, waiving entrance fees, and other programs at all 124 national parks across the country.
In California, that means free admission to:
Cabrillo National Monument
Death Valley National Park
Joshua Tree National Park
Lassen Volcanic National Park
Lava Beds National Monument
Muir Woods National Monument
Pinnacles National Park
San Francisco Maritime National Historical Park
Sequoia & Kings Canyon National Parks
Whiskeytown National Recreation Area
Yosemite National Park
Cabrillo National Monument will host a special Founder's Day event from 10 a.m. to 3:30 p.m., including ranger-led walks and talks, park film screenings, and open admittance to the Old Point Loma Lighthouse latern and balcony.
If you miss Friday, though, don't worry. There are three more opportunities to take advantage of free admission to national parks: Sept. 30 for National Public Lands Day, and Nov. 11-12 for Veterans Day weekend.