A few questions:
- What type of bike are you renting?
- Riding 2-up, or will you each be on a bike?
- Which do you prefer: very twisty roads, or scenic, or a combination?
I live in Ottawa, Canada. From Sept 5 - Sept 18 , 2012 I rode about 5,500 km in California (actually about 400 of that was in Nevada.) For the 2 weeks I had a total of only 30 minutes rain!
For my trip, because I had ridden previously in California, I stuck mostly to very twisty roads - there are plenty in CA!
My trip was wrapped around meeting other riders for a weekend in Eureka (about 1 day's ride North of San Francisco.) But if you think it would be useful I could send you the routes with descriptions.