Originally Posted by StreetDoc
...there was an area (not marked off) where you could ride through the trees and end up on a run that was not opened, you had to duck ropes to get back to the open run then. If it was your first run you could feasibly not know it was closed until you were there already.
I think this is the most important point. You essentially never went out of bounds. If the resort wants to declare an area out of bounds, they have to actually rope it off. A lawyer could have a field day with this. Me, I would have just said to the goons "then you should rope it off up the hill".