I have Spanish relatives visiting in a couple of weeks who want to spend a Wednesday in Napa. They know a lot about wine but I have not spent enough time in Napa recently to know the best places to take them for wine-tasting and for a reasonably-priced California-style lunch. I am considering stops at Sterling and Mondavi but have no real firm ideas. I ran a search on the board but did not see anything on point. Does anyone have any wine-tasting or lunch stops to suggest?