North of the Bay is the famous Napa Valley. Even among teetotalers (or people under 21) the valley offers points of interest.
Old Faithful, a hot water geyser, springs outside Calistoga. Yes, that is the Calistoga where the bottled water comes from. To be named faithful, a hot spring has to do it's work on the clock. Consequently you can be pretty sure to actually see an eruption with regular intervals.
The little shop/exhibition connected with the spring contains a seismograph, continuously measuring the little tremors in the ground. Obviously, you can also see the paper rolls from when the tremors were not benign.
An earthquake can change the rhythm with which the spring erupts.
On the way from Napa towards St. Helena you may easily overlook a sign to the Petrified Forest along the western slope of the valley. As if earthquakes was not enough, we apparently also have had exploding volcanoes around - millions of years ago.
The round trip is interesting enough and short enough for kids 6-7 and up but not recommended for those hard of walking.
For the adult population who likes a glass of wine, there are bike rentals, limousine services and the Napa Wine Train so you don't need to drive under the influence. That said, biking under the influence has its own risks, including being fined.
The alternative is to take turns being the designated driver (or as we say in my family: the disappointed driver). Having the metode champagniose explained can be quite interesting - even when you are sober.
Don't miss the beautiful Silverado Trail, the route running along the east of the Napa Valley.
Sonoma Valley is wider and generally more industrial than Napa Valley but has some really good vineries as well.
Finally, if you are tired of looking at acres of grape fields and like the cartoon Peanuts, visit the Charles M. Schultz Museum in Santa Rosa. As is well known to readers of the strip, Schultz had an affinity for ice hockey. Less known is it that he was instrumental to bringing The Sharks to San Jose.