As V says, Mt Veeder is a nice ride, but it does get steep at the top.

I suggest you call Gaby- she is from the Eagles Cycling club in Napa. She will not only give you great routes, but also great directions. She works at a bike shop in Napa (Bicycle Works- 707 253 7000).

The club has regular rides on the weekends. There is a ride just for women on Saturdays which Cheryl leads. I've done this ride and we had a great time!
They do a decide and ride as does the Sunday group. I've ridden with this club and they are quite friendly. My club did a joint ride with this group, and I just did the Seattle to Portland ride with Gaby, Cheryl, and 2 other women from this group.