Bought some land and moved last spring.  A posted snowmobile trail runs along the west boundary of my property, supposed to be in the ditch, but I've had several tracks coming up onto my land and cutting the corner.

Wouldn't be a big deal, but I planted saplings that are now getting run over, plus I have a young son who likes to explore the woods - he's been told to stay away from the ditch, but I don't feel like I should have to tell him to stay off our own property.

What have others done in this situation?