Well, Rhapsody in Sonoma is very popular.  She is full figured, and pretty fully priced at $400, but she has a great reputation.  At a bit of distance (in Santa Rosa now, I believe) you will find Lissett, who provides both massage and more.  She may look a bit older than some ladies do, but Oh, I miss her!  (I'm away from the area for now.)  I think you can find them both reviewed on TER.  There are not a lot of ladies right in the Sonoma area, but if you expand to the whole SF bay area, the supply is overwhelming.