The Presidio is San Francisco’s largest park and although it was a U.S. military base until 1995, its natural beauty has been preserved so that today it is a great place to enjoy a hike through the woods down to Baker Beach, a north facing beach that frames the Golden Gate Bridge in the background. Just don’t expect to go swimming here. It is almost always too cold. But visitors who bundle up in sweatshirts can enjoy a brisk beach walk. The coastal part of the Presidio will also lead you down to Crissy Field by the Marina District, where you can walk, jog, or bike along the ocean. For those of you ambitious enough for a walk across the Golden Gate Bridge, Crissy Field will lead you there.