If you are a spontenous kind traveler that enjoys a good adventure without the constraints of a organized tour, here is a short list of must see wineries and attractions plus mud baths and 5 star restaurants.
To complement the list above you may want to consider a balloon ride or other form of unique transportation while in Napa.See the Valley from a bicycle instead of a car, or check out how much different the Valley appears by train or hot air balloon!
