Believe it or not, there are a few things worth seeing in Napa [1] outside of the wineries. Granted, the major industry pervades even the museums here, but the arts and parks of Napa can make a wonderful break from tasting wine, or a whole-day adventure if vino isn’t your thing.
Links:
[1] http://www.moon.com/destinations/california/wine-country/napa-valley