Watt
There's two wine countries in California now even though that will cause some debate. Being from the Central Coast we love the winery's around Atascadero and Paso Robles. There is a RV park called Wine Country RV Resort on Hwy46 East of Paso that has walking trails that lead to three or four winery's and tasting rooms all with in walking distance. The winery's will even deliver your purchases if you buy something right to your RV.
There are also a couple hundred small and large wineries with in the area, some have weekend bar-b-cues, apple pie and other activities, lots of fun.