So I just got back from a week in the Yukon. I've been wanting to go up there forever to do some mountain biking and finally had my chance! Signed up with Boreale Explorers, and it was awesome. Got to ride in Carcross and Whitehorse. Would definitely recommend it, so many trails, and so much different terrain, I barely scratched the surface. Opted to rent their bikes, instead of bringing my own, which was a good choice, since they let me ride a Giant Trance 2, which is better than anything that I own. Looking forward to going back! And some photos...
The guide's bike (Kona Explosif) and my bike:

Riding the loam:

Hidden Lakes trail on Grey Mountain:

The lodge. This is 10:30pm at night, still plenty of daylight!