I'm not a fan of Sutter Home these days, but when I was in Sonoma County I enjoyed tasting the wine. What I didn't like was that there wasn't a formal tour of the winery and my fiance (boyfriend at the time) and I didn't get very attentive service. They probably thought we were stupid kids (we were in our early twenties, and had more disposable income back then than we do now).
It was a beautiful location though, and they also have an on-site inn with limited accommodations. For reservations, the phone number I have is (707) 963-3104 x4100