I wasnt overwhelmed by San Francisco, either its architecture, bus tour or its food, but the visit to Alcatraz was a highlight of the holiday and cant be recommended strongly enough.
We were only in town for 2days, so this tour was great we got to see all the highlights. Get there early and get on the first busses. Our first bus tour guide was Great! Mark (I think) he was full of info and tidbits about the City that's not on the recordings. The rest of guides didn't speak.