oooh ... I'm picturing one-way only (downhill,obviously), with fast-regenerating quoins to pick up on the way ... no stopping or slowing down! At the bottom you "crash" and your toboggan goes flying.
Heh, that could be an entertaining mini-game for obtaining ice-cubes for cocktail making. I can envision being able to speed up or slow down, and having to dodge obstacles, make jumps or even deal with attacking critters like magical snowmen throwing snowballs or miserable treants dumping a load of snow on passersby.
I like both the above ideas... they remind me of some of the levels in Donkey Kong Country 2. I'd especially be interested in seeing gaps you have to jump as you go downhill (or you get thrown back to the start, like in 3W).