We had a terrific time with Ari while discovering beautiful scenery (and wines!) in the Russian River valley. It was a perfect mix of wine tasting in several wineries (all with their each style), bicycling (16km on a road with not many cars), and a lunch outdoors. While some of the wineries waive the tasting fee with Ari's groups, some other don't - so you'll need to plan a little bit of extra cash (though most of them do also accept credit cards). (et au fait, pour les francophones - Ari parle un excellent français!) ((Ari does speak an excellent French ;-))
The thing I like best about this trip was that I got to see wineries I'd never get to see on my own. All my other trips in limo's or vans through Napa and Sonoma paled in comparison to the beautiful places we got to see on our trip. We took our trip through the Dry Creek River Valley, and it was a excellent trip all around, and it was really satisfying to get to each winery after enjoying the ride. Plus, the convenience of having everything paid for in advance means you just get picked up in San Francisco, and don't need to bring anything with you for the day (aside for some cash to buy more wine!) Thanks Ari and Alissa!