Not sure of the judicial/legal differences between Canada and the US, but here I believe trepass is implied. By that I mean that if there are no signs or such you cannot just go onto property under the false assumption that you are not trespassing. (There has been a fair amount of discussion on this topic here based primarily on hunting rules). By this I mean that if you have signs of any nature, (including the recognized symbol of the red circle), then trespass charges can be laid upon anyone entering the property without permission and without need for warning. However if you do not have signs you are unfortunately legally obligated to warn them to leave at least once before anything can be done. (this is for people not hunting.. hunters can be in deep trouble regardless of signage). I think the safest thing is indeed to get some insurance and post no trespass signs. I mean even if we are 100% in the clear the insurance will really help if someone does try to sue regardless of their chance of victory. It really is a shame that a judge way back when set the precendent for suing someone for injuries sustained on private property when they were there without permission. My worst tresspassers are surveyors for the Ministry of Transportation trying to get apiece of my land and my convicetd felon neighbour. (Yep... my country neighbours aren't what they used to be).
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