Honestly the food! I remember eating a breakfast that we had delivered to our room, and not even wanting to finish it, it tasted like pure butter/grease. We had dinner two nights there, and i got the same thing both times because the selection wasn't that great, and even though it's a golfer's resort, the prices for the food was not worth the taste, so i recommend eating out.
This was an absolutely beautiful resort, and we learned on our travels in Napa that it was the first of it's kind in the Valley. While we aren't golfers at all, the views were stunning and so worth it. We are a young, happenin' couple, and although we didn't fit right in, i would totally go back here. You can call a golf cart or shuttle anytime you need which was awesome, and they even helped us set up other transportation.