Ok Cab is my favorite. My wife and I went to Napa/Sonoma earlier this year. I have never hasd so many fine wines in my life. The highlights? The estate of Gloria Ferrar is priceless as is the champagne and the pinot nior.
Milat is a very small winery, (42 acres), but every sample was necture from the gods.
La Crema, Peju, Francisca, I won't forget.
Stay in Mill Valley. It's a great little town to start the day with.