Speed skating can be a good watch. The likelihood of someone slipping and taking everyone out is high.
Many of the freestyle sports have been ruined by becoming olympic events as predicted. Too prescribed in order to have a consistent judging set up now when pre-olympic days it was about progression and style. I will be watching the ski halfpipe though. That's a good spectator sport.
Downhill skiing for the speed and danger.
Another sport ruined by the olympics is snowboard cross. It used to be a great fun watch more like demolition derby on boards.Tamed down now and not as exciting.
Bobsleigh and luge can be good depending on how wicked the track is. We went down the Innsbruck course in a four man bob one night and it was scary as all fuck. Highly recommended.