These are the rides I did out in OC.
Whiting Ranch and the Luge:
https://www.strava.com/activities/48374824
San Juan Trail:
https://www.strava.com/activities/48498075
Trabuco Canyon/Holy Jim:
https://www.strava.com/activities/48646847
Whiting ranch was fun but it was just a quick local ride since I got there in the afternoon and didn't have time to travel far. The other two are definitely worth doing. I rented a bike from The Path in Tustin (I think
@jdog knows the guys there?)
There was some other stuff I wanted to hit too, but I don't remember what. Let me know how it goes, I'll be out in LA in February probably looking to ride some stuff.