With this San Francisco combo tour, head for the hills of Napa and Sonoma for a full day of wine tasting, and then visit Alcatraz Island the following day. In tranquil wine country, you’ll taste award-winning Sonoma and Napa Valley varietals at four to six wineries, plus enjoy a gourmet picnic. This day trip by biodiesel minibus also includes a vineyard tram tour at Benziger Family Winery to learn about biodynamic winemaking. The next day, head to Alcatraz by ferry, and take an audio walking tour of the infamous former prison.