How much time do you have?
As Z42 said, LOTs to shoot.
You could spend a day just shooting China Town, another day along the bay, a day on Alcatraz, another day along the coast, a day in Golden Gate Park . . .
There is a guide book on photography in SF "Photographing San Francisco, Digital Field Guide." That would be a good start, as it would list a lot of locations all in one book. It has been quite a while since I thumbed through that book, so can't tell you about it.