Hop on hop off downtown bus tour san francisco dungeon a visit to san francisco just wouldnt be complete without a ride aboard an original open top double decker bus enjoy this entirely live narrated one hour tour of san franciscos most famous sites the downtown tourincludesunlimited ticket use for 24 hoursso you can hop on and hop off the bus at any of the designated stops during the tour to browse shop and take pictures explore the highlights of san francisco at your own pace a