Wine Country RV
is a great park right down the street from Tobin James. I believe it is the closest.
It is a little costly, but a great park. I think I got a Premium site last time, but should have gone with a normal site. The gravel and grass sites are great.
Tobin James is probably my favorite winery in California. We use to live in the Bay Area, so we would go to Napa (least favorite), Livermore, Gilroy, and Paso Robles. Out of all of them, Tobin James is probably the most fun, and love their wine!!
Have a great time - that is a great area with lots of cool things to do.
If you are going to be close to the Bay Area and need a place, let me know - I have some discount cards for Coyote Valley RV just south of San Jose. Nice place to stay.