Hi Stapla,
Go ahead and PM me when you'd be interested in riding. Generally, I'll know if I'm available the Thursday before any coming weekend. I don't know Napa all that well, but Sonoma's my rolling grounds. Have you looked into the Santa Rosa Cycling Club (www.srcc.com). We just got voted the best Cycling Club in the Western US and have rides group rides of varying levels every weekend.
Deanna
"Bicycling is a big part of the future. It has to be. There's something wrong with a society that drives a car to workout in a gym." -- Bill Nye