San Francisco is certainly a wonderful place but Travis AFB is not in SF. It's in Fairfield. It's about an hour to an hour and a half from SF depending on traffic. I would rate Fairfield about the same as living in Jersey somewhere outside of Manhattan. The train (BART) around the bay area doesn't extend out to Fairfield although Amtrak does of course. On the weekends traffic through Fairfield sucks because of everyone going in and out of SF.
Good luck on your adventures!! Moving is always stressful but it can be quite an adventure too.