Open water snowmobile riding, Ontario Canada.
 

Love this video from Georgian Bay, I think the Helicopter is having a hard time staying with them.

YouTube - open water snowmobiling georgian bay

I have watched those videos 100`s of times and still love it. There was another video they made and was on u-tube but its not there anymore, there was 3 sleds and it showed 1 of them going down and a balloon being set for locating.
I`m located in Toronto so I try to find all the Ontario stuff.