One of my favorite wineries to visit in Napa Valley is Opus. To me, the winery looks like a shrine to wine. They spent a lot of money building the winery and it has many fantastic features to see during a tour.
The wine tasting and tour will cost you $25. If you feel like splurging, this is definitely a place to go.
Hours of Operation: 10 am to 4 pm, daily.
Tours: Daily at 10:30 am – by reservation only.
Tastings: $25, but a must do, at least once, for any wine connoisseur. Opus One is the King of wines around here, so unless you can afford a bottle (starting at $125 a pop for a young vintage) the best way to taste the excellence is here at the vineyard.
$25 for one tasting of their current offering. Wow! That's expensive! You certainly can't do this all day long. But the vineyard is an awesome place to visit.