You ever visited Montevina vinyards? They tell (or at least, used to tell) guests that they are more than welcome to explore the grounds, but to keep an eye out for rattlesnakes, lol. I went nuts for their zin when I first tried it.
I think that I should recommend that all of you folks come up to Eastern Washington's Yakima and Columbia Valleys to taste some of the finest cabernet in the world. Leonetti Cellars is the best although 1. They only open to the public by appointment. 2. There is a four year waiting list to purchase their Cabs. and 3. Their Cabs retail for over $100 upon release.
Still, visiting the vineyards/wineries of Red Mountain, Terra Blanca, Porteus, and L'Ecole is highly recommended for any trip to Washington state.