DH, myself and our 2 DD's (13 and 16) will be stopping in San Francisco for one day before continuing on to the Fresno area for a mission trip. We've seen SF before, but we will have DD's friend along, who has never been to SF. Time will be short, but we'd like to at least show her the GG bridge and some highlights of the city. We were thinking of doing a 4-hour afternoon tour and then getting a bite to eat before catching the BART back to our SFO hotel. Any advice on a good tour company or casual place to eat an early dinner? Thanks!