I remember when So Cal was infested with Raider fans, and like a bad case of ****roaches, it took some time to exterminate the pesky scourge, even after Al moved the team back to Oakland.
Though I reside in LA, each year during the 16 week season, I spend an average of 6-7 of those weeks working in N. Calif, in fact often in Walnut Creek. So as an out of towner, I've checked around, and on a couple occasions, found myself at rickfinsfan's aforementioned "Crogans".
Its definitely a lively crowd there, even though it generally seems slower for the 10am games, there's another cool bar in Walnut Creek I've seen the Fins game called The
"Stadium Pub"