I will be traveling to San Jose but flying in and out of SFO. My co-worker informed me that she has never been to SFO and I wanted to do a quick day tour. We will have a rental car in SFO but I'm wondering what will be my best option for the car and baggage:

- Delay the rental car pick-up until the evening and take BART downtown? If I use this option, what do I do with my luggage?

- Take the rental car downtown and either park on the street for the day or in a garage? I don't want to use valet and I don't want to leave the car keys with an attendant.

Any thoughts?