Ralph & Lahni de Amicis, Napa, Sonoma, San Francisco
They have beautiful buildings and gardens, and a great tour and sit-down tasting of their single vineyard wines. They are associated with Far Niente, and when you make an appointment with one, if it is booked, they can check on the other for you.
They also do just tastings but the site is so cool that you should do the tour if you can. The winery sits across from the Robert Mondavi Winery and you can spot it from the horses grazing in front of the house. Their prices went up but because they added a cheese pairing.