I use pt everyday since I'm not riding my motorcycle everyday. In the San Francisco bay area, you can get around 24-7. I've carpooled into the city when I was staying in the East bay. We have Vanpool and Casual carpool. For pt there's:
- BART -- subway that goes between counties of San Francisco, Alemeda, Contra Costa, San Mateo
- Muni -- buses, trolly cars, Metro trains and cable cars. In San Francisco only
- SamTrans -- SanMateo County Transit. Buses only
- Caltrain -- Comuter train that runs from San Francisco to Santa Clara County
- Amtrack -- all over the US. Best way to commute from Sacramento into the bay.
- AC Transit -- Alemeda County transit
- Golden Gate Transit-- from Marin and Sonoma counties--busses and ferries
- Bay Link Ferry
- Blue and Gold (mostly tourists) Ferry
- Red and White Ferry
City Car share--A car sharing service where you pay only for the gas.
There are more but I think you guys get the idea. You really dont need a car here but it can be helpful.