My husband and I stayed at a local hotel and booked the wine wrangler through them as part of a package. What a great way to tour several wineries in one day without worrying about driving. Bruce, our guide, knew everything about the wine and the wineries. He was great company during the trip. This includes a great picnic lunch which we ate at one of the wineries with a great view. Being a part of this tour also gives you discounts on your wine purchases.
Don't count on sitting and sipping your wine though. You spend your time standing and sipping while the wines are explained. It's very interesting and great fun but not really a relaxing day. The relaxing part comes later when you get home and spend the evening sipping one of your purchases.