Savannah is a great town and super fun. However, I can't say the beer scene was fantastic, at least downtown. I spent a few days there last spring and had a blast. The food is amazing and you absolutely must do a ghost tour with Blue Orb. Even if you roll your eyes at the idea of a ghost tour, you should give it a try. The Blue Orb's is excellent.
There's a growler place that's part of The Beer Growler franchise. Large selection, not much super high quality. Worth a stop in for something if you just want to try something you've never had before. (Since you're from SF, there might be some more interesting stuff for you.)
Service Brewing is a cool little brewery just off downtown. Not mind-blowing beer, but they have a large space and a ping pong table. I happen to go on their anniversary party and had fun.
Hops and Barley is a good store. If Creature Comforts is anywhere, it's probably there. Lots of good stuff from around the south in there.
Protip: no open container laws in Savannah, at least in certain parts of downtown.