Inglenook - owned by Francis Coppola. Known for a couple of killer wines... Rubicon, and their Cabernet Sauvignon "Cask" (which I don't know if they make anymore, but you can buy back vintages). Book a private experience, where you do a seated tasting in the cellar where some of Mr. Coppola's oldest wines are stored. You get a cheese plate with the tasting. It's a great experience. I liked that you could buy half bottles at the cellar door, maximising what we could bring back duty free..
Ferrari Carano - An amazingly beautiful property, with superb wines. Again, book a private wine tasting.
J Vineyard- J makes sparkling wine, and a fantastic Pinot Noir. Do the legacy tasting with the cheese pairing (I think you taste about 7-10 different wines, so you'll want the food!). We brought back a few bottles of their Vintage sparkling, and left a case of Pinot to age in my brothers cellar to enjoy on our trips over to the US (and we bring bottle or two back each time of the Pinot or of the case of Rubicon and Cask we have at his place as well).
I don't know what the fees are for the tastings, my brother is a member of all 3, so the fees were waived.
Tell me you booked French Laundry?!?! If not, there is an excellent place for dinner called Madrona Manor. An old mansion, with about 3-4 tables in each dining room. Beautiful food, intimate atmosphere, great wines, and excellent service.
Also, The Conservatory. It is a restaurant run by the Culinary Institute of America, and all the staff are students who rotate through being servers, cooks, etc. You can also do a tour of the institute which is a real experience. Made me want to change jobs!
I think it's only open on weekends, as the students are obviously in class the rest of the week.