At this time of year and in springtime, snowmobile riders risk hypothermia and worse from falling through thin ice.
A safer alternative to having fun is a personal leisure hovercraft, which fly at a height 9 inches above any flat surface. The Hov Pod is manufactured from HDPE so has excellent buoyancy properties, and is very strong. Hovercraft are often used in rescue operations, and are true all terrain vehicles capable of flying over ice, snow, sand, mud, water, grass and even tarmac. For more details and video see http://hovpod-snow-and-ice.blogspot.com/