Boy these are great. First thing I would do is see who is in charge of the lease. Talk it over with them with all the respect in the world. If this doesnt change things then I would start small & work you way up in the tactics you use to deter them.

I am a very private hunter & I hate running into other hunters when I am in the woods. There probably is nothing worse then at lights up theres a dude 15 feet away from you hunting. For both people this is a frustrating asspect. If you talk to them with respect they probably will understand. Dont threaten them if things dont go your way though just do your deeds. They will get the point.

I wonder if a strobe lightwould deter a deer on opening day. put one of those out by all the stands the night before opening day.