You've got an excellent chance of decent weather. Corte Madera is in Marin County, an excellent place to launch a ride. Up Hwy 1 is probably the best roads and scenery, if it's not cold/wet/foggy/cloudy. If it is, oftentimes going inland will solve the problem. Great roads around Lake Berryessa and Calistoga, which would be a great place to stay. Some pics from a ride I took there last November:
http://gromitspapa.smugmug.com/gallery/2333161