3rd Street Aleworks in Santa Rosa - good beer and a fun place.
Bear Republic Brewing Company in Healdsburg (don't miss this one) HOP ROD RYE RULES!!
Moylans in Novato - great IPA and bitter
But do yourself a favor and go up to the Anderson Valley. Great wine, fewer tasting fees, much more beautiful and mellow. And the Anderson Valley Brewing Company...great beer. It's *the* place to go wine tasting IMO.
If you make it to the coast, North Coast Brewing Company in Fort Bragg is awesome.
I'd skip it, but the Mendocino Brewing Company is in Hopland.
There are a couple in San Rafael...nothing notable.
That should get you started. Have fun when you're out here