[cgolvin]

Ditto previous comments on starting point, but also what you're looking for -- scenery, elevation, distance, duration, etc. We had a serious cold snap over Thanksgiving, including a lot of snow at unusually low elevations, but it has warmed up a bit and your options are plenty.

The more detail you provide the more likely I (and others) can offer guidance and routes. In addition to where you're staying, whether you will have access to a car to drive to a starting point.

If you're going to be here between Xmas & New Years there will be a number of Rapha Festive 500 rides you could join.

Edit: the Circle of Doom route posted above is great, but I'm pretty sure that the closed section of 39 up to Angeles Crest would be a nightmare right now.