I'm one of those cross country skiers who hates it when someone comes along and messes up the track. If it is a multiuse track, and I've encountered a few of those, shrug shoulders ... I'm not expecting them to be pristine. But if it supposed to be a dedicated cross country ski track and it has been messed up ... not impressed.
I've also been a snow biker and I enjoy doing that ... I'm just aware of where to go, and where not to go.
There are some snow biking shots in this set:
http://www.flickr.com/photos/1430288...7602332361641/