This is a fantastic experience for the family. I might worry about children under 7 falling off, but the view from the continental divide are incredible. On a clear day you can see 100+ miles. We recommend Steamboat Snowmobile Tours who will pick you up at our town house and drive you up toward Rabbit Ears Pass for an incredible adventure. We enjoy the 2 hour tour, but a 4 hour is available, but is eaten up by lunch. Helmets, goggles and boots are provided.
http://www.steamboatsnowmobile.com