Golden Gate National Recreation Area is a section of the National Park Service that maintains and looks after a very large group of Bay Area locations.
For more information:
Marin County: Bolinas Ridge, Fort Baker, Fort Barry, Fort Cronkhite, Gerbode Valley, Kirby Cove, Marin Headlands, Muir Woods National Monument, Muir Beach, Muir Beach Overlook, Nike Missile Site, Olema Valley, Point Bonita Lighthouse, Stinson Beach, Tennessee Valley.
San Francisco County: Alcatraz Island, Baker Beach, Battery Chamberlin, China Beach, Cliff House & Sutro Baths, Crissy Airfield, Crissy Field Marsh & Beach, Crissy Field Center, Fort Funston, Fort Mason, Fort Point National Historic Site, Lands End, Ocean Beach, Pacific West Regional Information Center, Presidio of San Francisco, Sutro Historic District.
San Mateo County: Milagra Ridge, Mori Point, Phleger Estate, Sweeney Ridge.