If you want to see a few different wineries and don't know where to go, we recommend the wine trolley. All together it cost us about $170 per person, including the trolley, vineyards, water all day, lunch and the tip.
Joe our tour guide was very fun, entertaining and knowledgeable (he really made the trip AWESOME)!!! We got to go to 4 different vineyards, drink great wine, and meet some pretty cool people along the way- we got some new facebook friends!. There was water available all day long and the lunch was actually really good!!!
Ravenswood- $20 per person, you got to go in the vineyard- get a little bit of history, taste wine and eat the grapes, they talk was a little to long, and it was hot, but the wine was good and it was a good experience. (it was the most expensive of the 4)
Buena Vista- $10 per person and it was our favorite of the 4. The wine was great, the property was beautiful. The tour was great and again the wine was great, so was the cost)!
Imagery- $15 per person, property was nice, but we just went into a room to sample wines (which was great)!
Mayo- $5 per person, the owner Jeff Mayo was there, he took us into the barrel room, and we drank and sampled wines the whole time. The port wine was amazing..