If you're interested in a very hilly century (or metric) check this one out. Looks like good weather for this weekend.
Here's the executive summary.
South Diablo to the junction
back to Danville and once more up South Diablo to the junction.
About 8-9,000' of climbing I think.
More info here: http://www.emcteam.org/ 
Entry on Sportsbaseonline: