Founded in 1981, the Golden Gate National Parks Conservancy is a nonprofit cooperating association that supports park stewardship and conservation in the Golden Gate National Recreation Area—the most visited national park in the U.S.Recognized as one of the largest park partners in the country, the Parks Conservancy has provided nearly $300 million in aid to support San Francisco Bay Area parks including the Presidio of San Francisco, Crissy Field, Muir Woods National Monument, Lands End, and Alcatraz Island. Wikipedia