It sounds like the same guy I have living next to me. he's been doing this for over 30 yrs. Nothing would change his mind, not even money. But you can hike, take photos, do research, anything you want. But hunting, shooting a firearm, or use motorized vehicles is out of the question. Its America, he has the right. On the positive side they can't stop you from hunting the fringes.
If you look at my recent shed photos. Yup, they came from those fringes. What I do is find out were the deer leave the property, and have real good luck. If you own property next to him, plant something that will bring them to you. Good luck