We took a tour of Grgich Hills Estate in December 2011 and found that it was well worth the money ($35 per person). We were led all around the estate and learned about all aspects of the wine making process. Along the way we tasted a variety of wines, including several that were not included in the original tour. Our guide was informative, friendly, and answered all of our questions. All in all, the tour took a little over 1 hour, and there were only four of us on the tour (this was a strong contrast to tours at other wineries where 15-20 people were in attendance). The place has a bit of history regarding its involvement in the the Judgement of Paris, and it was a fun story to hear about there.
Certainly one doesn't need to do an elaborate tour at every winery, but if you're going to do it somewhere, I'd recommend Grgich.
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