The key word for me has been "thick". The big boys don't get big by exposing themselves for any length of time. Sure, during the heat of the rut you may see them any where. I like the thick bottlenecks that intersect the buffer zones between feeding and doe beeding areas. Sometimes I see deer that I can't shoot. Sometimes they get in spitting distance without offering a shot but all good things come with patience and time. I also really like fingers of timber that extend out into crop fields that decrease the distance a buck has to expose himself from wood line to wood line when crossing. Finally, here in KY we have a lot of fire breaks and/or power line breaks in timber. Bucks will cross these often in low drainage and creek areas where the briars and bramble grow out of control. Get on one of the sides perched high above so you can look down and it could just pay big time.
Water, like camoham stated is also critical. During the early months when its warm and during the rut when the bucks are doing a lot of moving, H2O is essential. However, mature deer can be pretty particular about where they drink. I have seen them drink out of mud puddles rather than the ponds in the open fields.
I sometimes really envy the folks that hunt in the midwest farm country where cover is sparse and crops are abundant. I see a lot of hunting shows that show guys bowhunting in these areas right on field edges. Where I hunt you may have 75 acres of corn in the middle of 500 acres of timber. The corn often is planted close to the woodline and the deer could come out anywhere on any given day. Also, here in KY we have a very varing terrain that makes it difficult to hunt. I joke sometimes that every place I hunt requires that I climb a mountain or a steep hill. I wouldn't know how to act hunting flat ground. Our deer always have 2 legs shorter than the others!:wink: