One of the best possible day trips you can take while visiting San Francisco is to Sonoma and Napa Valley for wine tasting. A fun and relaxing way to experience this is through Grayline on their popular Deluxe Sonoma & Napa Valley Wine Tour. The eight-hour tour consists of pick up and drop off from San Francisco hotels, wine tour and tasting at three wineries, as well as free time for lunch. I recently had the opportunity to join Grayline's Sonoma and Napa Valley tour. Here's a look at what you can expect.