Good Wineries in Temecula
I'd stop by smaller wineries like Hart and Filsinger. Hart has been there pretty much from the beginning. I can't remember much about Filsinger except the proprietor often dressed in a western shirt and bolo tie (very nice guy). These days, try to avoid the weekend total zoo.
I remember first visiting the area over 25 years ago when there was *Nothing* on Rancho California road east of Marguerita. The amount of development out there is scary and depressing.
Link to Temecula wine makers: http://www.temeculawines.org/default.asp
41300 Avenida, Biona Temecula, CA
Filsinger Vineyards & Winery
39050 De Portola Rd, Temecula, CA