En route to Taiwan, my mom and I planned a short 2-day "layover" in the San Francisco area to visit some relatives. We made a last minute decision to spend a day in Napa Valley as neither of us had ever been. Since we already had a rental car I decided to drive instead of opting for the tour bus route (most tours I found are $80-$110/pp for 3-4 winery visits, not include tasting fees). I spent quite some time researching which wineries to visit but in the end decided to go with recommendations from friends, and they were spot on.
Life doesn't get much better than this. :o)