Looking at riding a 30-40 mile loop around Black Mountain/San Dieguito/Hodges/Elfin/La Costa. Open to time and place, although I tend to roll out near dam at Hodges. The world will not be ending, but you could still make this your last ride. http://www.npr.org/blogs/13.7/2012/12/19/167530202/a-guarantee-the-world-will-not-end-on-friday
