or, Standing on the Shoulders of a Giant: The Golden Gate Bridge, from the Top.
It's big, it's red and it's the one thing everyone who visits San Francisco has to photograph.
Land's End and adjacent Lincoln Park stretch from Ocean Beach & the Cliff House northwest to the wealthy Seacliff neighborhood (ask a local to point out Robin Williams' house). A trail follows the coastline along the park's length, offering fantastic views of the nearby Presidio, Golden Gate Bridge, the art deco VA Hospital, and the Pacific Ocean.
Its somewhat remote location in the Richmond District means you likely won't get stuck in a crowd (aside from those rare warm Saturdays), even though the Legion Of Honor museum is just up the road.
Walking along the Golden Gate is transcendent -- the city in the hazy background, islands and mountains dotting the vista, and wide seascapes all around. There are, however, a few sobering reminders along the bridge that not everyone loves the walk as much as you do.