From April 17th to April 25th, more than 100 national parks will get even more crowded than usual with the FEE FREE DAYS.
Fee Free Days in 2010 will also happen on September 25th and November 11th.
Here is the list of the California Parks:
Cabrillo National Monument
Death Valley National Park
John Muir National Historic Site
Joshua Tree National Park
Lassen Volcanic National Park
Lava Beds National Monument
Muir Woods National Monument
Pinnacles National Monument
San Francisco Maritime National Historical Park
Sequoia National Park
Whiskeytown Unit National Recreation Area
Yosemite National Park