Kicking Horse, Fernie, and Whistler
Yeah, I've done it a bunch of times. It's just sick. Best places to do it is at resorts during the summer. They have hooks on the back of the chairs and it takes your bike to the top. They also have runs laid out the same as winter (green, blue, black, and double). I've tried out in the woods but a downhill MTB usually weighs 40+ lb's and is around 5 Grand. Better to rent, especially seeing as the chance to break something on it is fairly high. You also get perfectly maintained tabletops, berms, and kickers at these places. But seeing as you shouldn't be sitting down when attacking the trails, your Quads and forearms just burn. In a good way of course.
'12 Lib Tech T.rice / '12 Burton Cartels
'10 CustomX / '10 Co2 EST