When in Napa Valley, CA which are the "not to miss" wineries?

We are travelling to San Fran and plan on spending a day in the Napa/Sonoma area. The wineries are all starting to sound the same. Help me choose which ones to see! I prefer white wines, and from the moderate research I have done, it seems that a lot of the wineries in this area specialize in reds. Also, is it... show more We are travelling to San Fran and plan on spending a day in the Napa/Sonoma area. The wineries are all starting to sound the same. Help me choose which ones to see! I prefer white wines, and from the moderate research I have done, it seems that a lot of the wineries in this area specialize in reds. Also, is it worth it to see the Geyser in Calistoga? Any recommendations for good moderately priced restaurants in the area? Any other tips on things to do in the Napa area are welcome!
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