Snowtubing's cool. You've got this big round innertube, like you'd find at a waterpark, and you go down a hill on it. Most of the ski places have 'em and they haul you up the hill on a little lift.
Based on some of the people I've seen snow tubing, nobody has any size issues with tubing.
I'm sure it would be fun. I do have fun in the water parks. But I seriesly hate to be cold. I'd move further south if I could find me a good payin' job that way. I'd be happy if it never got below 60 degrees.
Snowtubing's fun :) So is tobogganing.