In San Francisco there is no finer view than that from its front porch: "Turtle Hill" to locals, or "Grand View Park" if you're checking a map.
If the North American continent is a ship then Grand View Park is the bow, giving epic, vast views up and down the California coast and of Golden Gate Park, the Marin Headlands, Golden Gate Bridge and Downtown. Sunset here is breathtaking at all times of year, but watch out for Karl the Fog crashing the party.