I live close to San Francisco and when I have visitors from outside San Francisco Bay area, I recommend them to take the City Tour offered by Extranomical Adventures to get to know the city better. The tour is fun, relaxing, informative and enjoyable. The tour offered by Extranomical Adventures starts very close to public transportation, have multiple options, morning, afternoon, half day, full day etc. depending on your schedule. I really like the flexibility to change time and dates with a nominal fee.