ttowle ... Rick has a damn good suggestion ... if you happen to take a side trip to SoCal, that is ... I-15 runs out of LA toward Las Vegas ... from the SF area, you'd be better advised to take I-80 east to Reno if you want to enjoy the cigar friendly environs of Nevada ...
Actually, there's a couple of spots in San Francisco you might want to try ... one is the Canterbury on Sutter Street, the other is a place whose name escapes me at the moment, but which is on Pine St, about half a block off Grant Avenue at the edge of the financial district ...
On your way to Napa, depending on how you route yourself, there's a very good Cajun restaurant/bar in Martinez that is cigar friendly ...
Drop me an e-mail before you leave to come out this way and I'll see about having some specific establishment names and their addresses, (I'll try to come up with some that are in the Napa/Sonoma area) written down to send you ... we might even be able to arrange a mutually convenient time to get together at one of these spots ...
copy/paste the below addy to the "to" space, then substitute (at) and (dot) appropriately
fromsteves(at)hotmail(dot)com