We did one of those tourist things a few years ago. Haul a mountain bike up a ski slope on the lift, then ride down. I'll tell you, it takes some skill to control a mountain bike in rough terrain (the Rocky Mountains). I have respect for those who do it regularly. When I got to the bottom of the mountain, I'm pretty sure they had to replace the brake pads on my rental bike! My fingers were in tetany from constant pulling on the brake levers. And there were others flying by us (literally, not figuratively) bouncing from rock to rock at about 90mph like a bunch of deranged rabbits.