Yountville's the best, feels like a movie set. All the restaurants are pretty much must-tries, but my favorite thing to do is get a cafe au lait and fresh croisant (and they have this like fried monkey bread thing thats incredible) every morning at Bouchon Bakery. There can be a line right when it opens so sometimes it's best to wait 15 minutes.
Otherwise French Laundry is the top of the list if you can get a reservation, should try it at least once. Bouchon and Bistro Jeanty are similar, I prefer Bouchon as I feel like Jeanty is a little too crowded and gets really loud, especially inside, like can't have a conversation with your table loud. Ciccio might be the best value in my opinion, and they have great cocktails when you're tired of wine. RH is a really pretty space, the ladies love it, the food won't blow you away and it's just wine/beer. We did Bottega like 15 years ago and thought it was just ok and haven't been back since, but I am sure it's not bad since it's lasted this long.