There's no reason to hike way back in, there will be people everywhere. Find the thickest, nastiest cover and hunt it. Stay all day, or the longest a 13 year old can sit. I've seen most my deer there, just before and just after lunch. I also quit showing up at 4 am to wait in line and just started going an hour before daylight. You're either going to be the guy that gets there early and has people walking under him all morning, or you're going to be the guy that gets some extra sleep and eats a good breakfast but does the walking. If you stay till Sunday afternoon, you'll have the place to yourself.
Good luck to you and your son.