The only downside to visiting a winery is that, unless tastings are kept to an absolute minimum, there always has to be a designated driver. (Or you have to make some kind of transport arrangements.)
Solution: stay at the winery. These days, the canniest and best-resourced spots are full-blown retreats, featuring day spas, wellness offerings, private functions, sculpture parks and more. They’re not itinerary-fillers on your country holiday: they are the holiday.