I have gained access to a lot of places by offering to hunt coyotes and not asking to hunt other game. If there is game there they have been effected or farm animals as well. I have ended up with a lot of new opportubities from this approach, All the above ideas are good too. Offering them something that will help them and not asking for anything in return seems to work well. It may take s few visits but it really has opened doors and with neighbors as well and they will offer you other opportunities. Give it a try you might be suprised.