@SusanCinadr There are so many great wineries up there it's hard to choose. St. Helena has two of my favorite ones: Arrowood and Beringer. Kunde Winery is on the way to napa and is a family run winery and you can bring a picninc lunch and soak up some sun. Another one in Sonoma worth mentionind is BR Chon. As far as Napa goes, you should definitely check out Domaine Carneros, it's a little pricey but is an absolutely gorgeous estate and has quite the view. It's all sparkling wines but they are delicious! Clos du Val is another good one in Napa as well.
I'd also recommend renting a car since there can be a fair ammount of driving! I've never actually stayed up there but I've heard good things about the Inn on First.
Hope that helps!
... View more