Last May, 3 of my friends and I took our dual-sport bikes to Lava Flow trails in Squamish, which are managed by our provincial off-road association called BCORMA. I was on a 2003 DRZ400S, with 2 DRZ400SM's with 21/18 knobby tires, and we had another XT 350 with us.
We've gotten a few looks from the local dirtbikers, quite possibly for taking our heavy pigs on their trails, and in retrospect it might not have been the best idea to ride anything else other than the easy 'green' routes, but we had a blast anyway and rode away with no injuries, other than a ripped backpack strap :-)