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Crissy Field

An airfield-turned-recreation-area-and-bird-refuge in the Presidio. Here, you could spend hours watching the kiteboarders skim over the waves—and crash spectacularly into them—but keep walking west, past the fishing pier (take a moment to look for seals in the water), to Fort Point, the brick Civil War–era fortress guarding the mouth of the Golden Gate. Now look up.