Murals! where? everywhere! walls, streets, signs, windows. keep your eyes peeled. I walk a lot in San Francisco and always seem to find new murals in the least expected places. They are a constant source of inspiration, and make me wish I could paint worth a damn.
#1 in the city for old book smell and creaky wooden floors. Too small to find anything specific you’re looking for, good enough that you’ll find something else instead.