I am havin the same problem where i'm hunting this year. Only thing is its my family's land. We went around to the different houses and farms in the area and asked them to please let us know if someone was back there on four wheelers, then we tried to block off the area as best we could, then we put up no trespassing signs, went back this morning and could here them back there.. planted afew of those silent cameras (ya know the ones that take pics and are motion sensitive so i have something to take to the authorities and have these people busted. I suggest doing the same. Notify the proper authorities and the landlord and find out who they are and then have them arrested if they come back