I'm travelling with my wife a long way to San Francisco next March. We'll be staying there (in Chancellor at Union Square) for eight days. I was thinking if I shuold rent a car and drive outside San Francisco to see something else besides the city itself and get back to the hotel for night. Other option is to try to find some agency which arranges that kind on journeys (minibus or something like taht??). What would you suggest? First of all, where to go to and secondly, does the traffic take most of the time or would it be worth to rent a car?