Golden Gate National Recreational Area

Horse riders climb the Old Springs Trail in the Marin Headlands, which are north across the bay from San Francisco.

Dusk settles along the Marin Headlands and the Point Bonita Lighthouse.

A couple share a picnic lunch at Muir Beach in the Golden Gate National Recreation Area.

Visitors to Muir Beach in the Golden Gate National Recreation Area.

A visitor looks over a map at Muir Woods, part of the Golden Gate National Recreation Area.

The majesty and shadowy mystery of the redwoods draw visitors to Muir Woods National Monument. These walkers are on the Fern Creek Trail.

Visitors pause at a trail exhibit among the giant redwood trees at Muir Woods National Monument.

A harbor seal eyes a fisherman on a pier in Horseshoe Bay near Ft. Baker overlooking the San Francisco skyline in the Golden Gate National Recreation Area.

A fisherman has the San Francisco skyline to look at as he tries the water off a pier in Horseshoe Bay.

A cyclist rides along a paved road in Ft. Baker near Lime Point.

Patrons of Travis Marina Bar, a.k.a. the Presidio Yacht Club at Ft. Baker, enjoy $5 pints and conversation.

A ferry transports passengers to Alcatraz Island in San Francisco Bay.

A visitor encounters a mannequin wearing a prison guard uniform at an exhibit inside the administration building at Alcatraz Island in Golden Gate National Recreation Area.

A rainbow appears above Alcatraz Island as seen from from Crissy Field in the Presidio. Alcatraz, also known as “The Rock,� housed a former federal penitentiary.

Alcatraz Island was used as a military installation in the 1850s, then for imprisonment of Native Americans in the 1890s.

Stand-up paddle boarders ply the water off of the Presidio’s Golden Gate Promenade, part of the Golden Gate National Recreation Area in San Francisco. Alcatraz Island is in the background.

A windsurfing enthusiast skims the water off of the Presidio’s Golden Gate Promenade.

Jake Schutt, center, of Mill Valley plays with son Luke, 10, left, daughter Elsa, 12, and their dog Fisher at Crissy Field in the Golden Gate National Recreation Area.

Birds glide above visitors to Ft. Funston Beach, part of the Golden Gate National Recreation Area.

Visitors descend a sand ladder to the beach at Ft. Funston in the Golden Gate National Recreation Area.

A hang glider soars above the ocean at Ft. Funston in the Golden Gate National Recreation Area.

A hang glider at Ft. Funston in the Golden Gate National Recreation Area.