Once a military base, The Presidio is now a huge public park on the tip of the San Francisco Peninsula. The Spanish established a military fortress on the site in 1776, and it was later turned over to Mexico, and then to the United States in 1848. The original name was the Royal Fortress of Saint Francis, fortress being a translation of “presidio,” and the area remained an active base for military operation until 1995. Since 1996, The Presidio has been a park. It's part of the Golden Gate National Recreational Area, but is operated by a private trust.
Among the many outdoor recreational opportunities within The Presidio are hiking, mountain biking, and golfing. The waters just off the park's beaches are great places to go kite surfing or sailing, not to mention fishing. There's also one camping facility inside the park that's open from April-October, as well as one lodge in a former US Army residence hall.
Stop in at the Presidio Visitor Center to learn about activities and attractions inside the park. The center is open Thursday-Sunday 10am-4pm. The park itself is open 24/7, and there are no fees to enter.