Angel Island State Park is an underrated gem. The Tiburon Ferry is a short ride and runs more frequently than the boat from San Francisco. Get on the first boat over to the island to escape the crowds. The five mile walk around the perimeter road has excellent views, and goes by the historic buildings, ruins, and bunkers.
The images below were made with a Lensbaby Composer using the Pinhole / Zone Plate Optic on the zone plate setting. The zone plate aperture is fixed at f/19. The camera was set on manual exposure with a shutter speed of 1/80. The ISO setting was used to control for exposure variances, and ranged from ISO 400-1600.