Actually I should try out a question myself to see if anyone has better advice. I have to be in San Jose tomorrow and the City Saturday night, then fly home Sunday. I have a free Southwest coupon so that's who I'm flying.

So I'm flying into SJC which is easy, then renting a car. Saturday morning I'm going to drop the car off at SFO, then take BART into the City. This will avoid another day of a car rental, plus the exhorbitant parking fees at the downtown hotel where I'm staying. Then Sunday, I'll either take a shuttle to OAK, or BART. How is BART to OAK these days?

Letiole, thanks for the security line tip for OAK. I'll probably use that since my flight is 6pm on Southwest.