To kick off National Parks Week, the entrance to many National parks will be free today (Saturday April 20th, 2019). Some of the geographically closer parks include: Pinnacles National Park; Muir Woods National Monument; and San Francisco Maritime National Historical Park.
The entrance fee waiver for fee-free days does not cover amenity or user fees for activities such as camping, boat launches, transportation, or special tours.
The annual $80 America the Beautiful National Parks and Federal Recreational Lands Pass allows unlimited entrance to more than 2,000 federal recreation areas, including all national parks that normally charge an entrance fee. There are also free or discounted passes available for senior citizens, current members of the military, families of fourth-grade students, and disabled citizens.