The Skizee was originally designed for the ski patrol, but it can also serve recreational purposes. The 10.5 hp 4-stroke engine can propel a skiier to high speeds, as you can see in the video at the link. Naturally, this is a product of Canada.
http://skizee.ca/index.html via DVICE
I notice the shots of actual patrollers using it seem to be in closed-off areas.
That said, it looks like a lot of fun and I want one.