I was going to tell you to check cyclecalifornia.com, but I see their web site isn't up-to-date. Here's another list of area rides at http://www.bikecal.com/asp/century-result.asp though. Also a few more rides not listed:

Top Hat, Grizzly, Wine Country and Delta are all great rides, and usually have good weather, great scenery and lot's of food. I'll be doing Top Hat, and either Grizzly or Delta.