I find it interesting that when people think about "wine country" in California, it is usually the Napa Valley. While it is a beautiful place and there are many very good wines being produced there, especially Cabernet Sauvignon, I think it has become overly commercial. Consider Sonoma County, especially the Russian River Region. It is much less commercial, more friendly, and being cooler, has superior Bergundian varietals, like Pinot Noir and Chardonnay. They also make great old vine Zinfandel and Syrah. A great place to stay and dine (superior restaurant) is at the Farm House on River Road in Forestville. It is on the left going towards the ocean. Unfortunately, no special Cobra parking that I know of. Should be able to park outside your room though.
If you're interested in great wine locally, consider the Santa Cruz Mountains. There are a number of fine wineries available right here in your back yard. I have no idea where decent B&Bs might be located. Worth a Google, though. Some great roads to drive on. But don't forget: the operative word is "taste," not drink, when you're driving, especially a Cobra. While "spitting" is tough to do when you're tasting really good wine, it is the right thing to do when you're visiting a number of wineries. Save the drinking for once you've stopped for the evening.
To my Napa enthusiasts, I'll quote the formerly funny comedian, Dennis Miller, "But that's just my opinion, I could be wrong."
Rich