Some of my Napa/Sonoma favorities. Apologies for repeats, I cut/pasted from an email I recently sent to someone with recommendations... As far as wineries, I like to visit mostly smaller, off-the-beaten path, boutique kinds of places, because of the people we meet. For them wine is a labor of love and they usually produce smaller quantities of high-quality wine.... Napa: Dutch Henry, Goosecross, Regusci, Chappelet, Sullivan, Vincent Arroyo, Chateau Montelena (gorgeous grounds), Sawyer, Graeser (very eccentric and funny owner), Vander Heyden (crazy dutchman but hilarious), Praeger Port Works (delicious if you like port wines), RMS is a brandy producer which has an outstanding tour as well. For sparking wines, try Domaine Chandon, Domaine Carneros, S. Anderson, and Frank Family Vineyards. Sonoma (which I am less familiar with): Kunde, David Coffaro (tiny place, phone first, superb wines), Amphora (tiny place, phone first), Preston, Pezzi King