Terrain. Anything from the standard big ticket items(benches, ridges, saddles, converging hollows) to those ever so sutble vegetation and topography changes. Iaccount for wind direction, lighting, climbable trees, access points and other hunters.
I also like to see deer sign. Some here do, some don't but if I'm going to walk 100 acres of land and 25 acres of it is tore up with sign, I will focus my attention there, or on the deer's access routes to/from that area.