Great trip round SF on open top bus (though cold, bring jacket even if sunny) especially as we were only there 2 days so got to see all the sights, go over Golden Gate Bridge etc. Our guide Donal was very funny and we loved his jokes rather than a great stream of facts.
Buses themselves were a bit shambolic, we had to wait ages in a cold parking area for the Sausalito bus, which then broke down on the way back.
Alcatraz trip a must see, especially for my teenagers. Overall a great 2 day event.