I don't know if you're still in the Bay Area (it's January, now) or not. But here's my thoughts on your request...
December and, especially, January are not usually goods months for sunsets along the coast in northern California. Even on a clear day, the western sky tends to cloud up very quickly as the sun goes down.
Having said that, two of the best sunset locations that I've come across are 1). Sutro Baths in San Francisco (next to the Cliff House restaurant), and 2). the Marin Headlands (especially Battery Mendel and Rodeo Beach). Here's on from
Rodeo BeachIf it is clear on the evening that you'd like to shoot, there's a restaurant with a large parking lot on Hwy 17 just south of Summit Road, halfway between Los Gatos and Santa Cruz. That spot has a spectacular vista of Half Moon Bay all the way south to Monterrey (on a clear day).
During those months, you might really want to focus on sunrises, I'm afraid.
Good luck,
Andy Frazer
Andy's Night Photos