SFO to OAK is about 1 hour on the BART if you hit everything just right. If you walk up just as the train is pulling away and have to wait for the next it takes longer. 1 1/2 hours, worst case scenario usually. There are lots of hotel choices from nice to dumps depending on what you are willing to spend. Life is good at 50%, weekends and holiday's off with 18 days off if that is your preference.