Marin County Points of Interest
Muir Beach Overlook is located within the Golden Gate National Recreation Area. A staircase and path lead to an overlook on top of a large rock in the surf. I am not aware of a similar perch anywhere on the California coast.
Also here are several observation posts, known as base-end stations, which were part of the San Francisco Bay coastal defense system. Soldiers viewed ships through telescopes and plotted their distance, speed, and direction in order to aim nearby coastal defense guns.