Will your Scouts have time to look for and analyze animal tracks/markings in the snow?
I don't know if they are doing a track identification event this weekend, sometimes they incorporate that into one of the stations. Funny experience with tracking... we had two boys track an animal that had come into our campsite the night before, and tear through some bags that had food in them and were left out. Probably something healthy, like Pop Tarts or Slim Jims.

They thought they were tracking a racoon, but, it was a skunk. At some point, one of the older boys went and chased them down before they found the den, and created another set of problems...