As mentioned above, you can use the internet to learn more about local wineries and vineyards in the Napa Valley area. What you may also want to do is search for printable wine country maps. Once you have a printed map, you can then circle each winery you would like to stop at along the way. Printable wine California country maps can easily be found with a standard internet search. You may also be able to find similar maps available for pickup at wineries and other establishments throughout Napa Valley.
In conclusion, you have a number of different options when looking to take a Napa Valley wine tour. As reminder, if you will be drinking, be sure to display caution. Many large groups make the decision to choose a designated driver and your traveling party may want to do the same as well.
The owner of our Bodega Bay Vacation Rentals had great resources for buses, limos, and even the wine train.