I think a cool ski game would be if you could drive around gta style, and the seasons change. So you can shred in the winter all over, find urban, go to the hill, hike around, snowmobile, etc... but then in the summer you can skate, fruitboot, bike, bmx, orrrrrrrrrrrrrrrrrr go find snow, (have hockey rink snow??) find a good spot and. hit it. YOud have to have a mini game where you build a drop, and have to find snow and set up in a given amount of time.
I think that would be a neet idea.