Welcome and congrats, Amy!
Here's a really wonderful venue you should check out:
Cuixmala
I photographed a wedding there, and it is really a spectacular place. To get a better feel for what a wedding held there would look like, you can check out the Cuixmala gallery of images on my website.
If you decide you'd rather have your wedding in a vineyard type setting, you should check out these venues:
Mayacamas Ranch, Calistoga, California: Weddings
Weddings Sonoma California | Wine Country Weddings | Weddings Wine Country | Sonoma Outdoor Weddings
Best wishes,
Tod