Returning at SFO is pretty easy; only three things I would keep in mind:
1. Traffic on 101 can be a nightmare, so leave plenty of time;
2. If you didn't buy the "fuel option", there are a few gas stations at exits immediately above the airport, but none in the airport exits themselves. Pull off at 425A if you're heading down from San Francisco.
3. Don't know where you're coming from and when you're returning, but the Bay Bridge will be closed from the evening of September 3 to the morning of September 8. If you're in the area around then, I can only say godspeed to you, sir.