In order to not list off half the trails at Whistler, or any NORBA series race course, I'd have to say Mt. Seymour shuttles is the most fun. CBC to Corkscrew to Pingu and Pangor and hit Empress on the way out. Such a fun run with a mix of ladders, drops and scary rocks. Either that or the local trails around the NW.
i really like dirt merchant to lower Aline. i can't think of anything i've ever done that gives me a shit eating grin like that trail. they should advertise whistler as the fountain of youth because i swear to god i'm 8 years old again every time i ride there. shout outs to silverstar too for the sweet bermage. and mount7 for its epic-nicity(new word).but damn you dead dog.