Same mead recommendation, but I also have wine region tips. My wife and I love to go to Anderson Valley; it's a bit north of Sonoma valley (NW of Santa Rosa on the way to the coast), but it's worth the drive if you like cooler weather varietals, fewer people, friendly pourers, and gorgeous hills. Good pinot noir up there, good Alsatian whites (for CA), some nice sparklers. And as a bonus, most of the tastings are free. Be sure to hit Breggo, Yorkville Cellars, and Lazy Creek; Roederer for sparkling. If you want to taste verjuice (sour grapes--Omphacomel anyone?), they sell it at Navarro. And eat at Libby's in Philo--the best restaurant in the valley (it's good greasy Mexican).
Otherwise in Sonoma, go to Benziger for a fun tour on a tram and a fairly wide selection of wine. We also like Matanzas Creek (awesome views too) and Kaz (which has some crazy wines made by a sort-of crazy guy). Haven't been much to the northern end of the valley though, and there are good ones up there too. In Napa we like Diamond Oaks (excellent value wine). And in Carneros (btw Napa & Sonoma), Domaine Carneros has expensive but very tasty sparkling wine. Their 1996 Le Reve was possibly the best bottle we ever drank.
If you want some "don't go there" recommendations, I can go find my notes for you.