I gather them at North Baker Beach. The views are stunning - you can see the GG bridge close by on your right, and Sausalito straight ahead. Some of the rock formations are gorgeous.
It's a bit of work to get to (rather steep trail) and sometimes you'll run into a flock of nude sunbathers during the warmer months. Just gather your goods and smile courteously when they give you funny looks. The things we do for our aquariums.