ORIGINAL: Red Lion
or you could string barb wire or better yet constantine wire across trails/paths cover with snow and after a couple hit the strings, they will stop coming on your land.
Snowmobile trails around here are run by local clubs that have permission from all the private landowners that the trails go over. If anyone has the sack to put strings, wire or any other obstacle across a trail, they are looking first at a severe beating and then a very long jail sentence...that is attempted murder if the snowmobiler lives, and first degree murder if the rider is killed...don't be stupid. This pisses me off to no end.