8.9 miles, Half day
This section of the California Coastal Trail runs from the Cliff House near the Sutro Baths all the way to the Golden Gate Bridge and passes many landmarks including Baker Beach, the Seacliff area, Marshall Beach, and the Batteries to Bluffs Trail.
This area of San Francisco is unknown to so many residents, even though it is one of the most beautiful areas in all of the bay area. You will walk along trails on the cliffs above the water where you can watch crashing waves, sailboats, and the occasional surfers, all while having perfect views of the Golden Gate Bridge and the Marin Headlands across the bay--it's hard to beat.
There are several small detours to small beaches along the trail as well, if you care to take a relaxing break.
There are several points along the trail where you can leave the trail or turn back to hike a shorter loop. It is 9 miles from start to finish, so it would be wise to arrange a ride back (there are busses at the end that can take you back to Golden Gate Park).