My only problem that I had was...SPENT TOO MUCH MONEY!!! :-)
This was a wonderful day, spent with a small group of people and a fantastic guide Don, who had arranged some really interesting places for us to visit, and taste a variety of wines from Napa and Sonoma Valleys. Cannot recommend more highly. Visitors from overseas should be prepared though for higher than anticipated tasting costs.
We selected smaller boutique wineries which I loved