There's lots of good ideas here, raking leaves off of trails is an especially good one. This is a topic very interesting to me, especially since I have actually been doing an ongoing experiment on hunting blind access methods and spooking deer, and the results are very different than I anticipated. We have a very good hunting spot on the edge of a field in the middle of the woods that has been in use by us for quite a few years, and there's almost always deer there when we arrive, almost any time of day or night, so I have been observing and keeping records for three years on effects of hunting access in observed deer quantities.
For the first two years we had been walking in most of the time, almost always spooking some deer as we did so. This year we have been dropping the hunter off and then picking him or her up with a fairly quiet gas powered golf cart with headlights almost all the time, almost always spooking some deer as we did so, generally the hunter is pinned down in the evening and the cart chases the deer away.
Before the season the crops and the deer usage in the field were very identical from year to year, but chasing the deer away with the golf cart after the hunting season started this year has definitely led to a much more pronounced tapering off of deer sightings during shooting hours, especially bucks. The evidence has been so overpowering that we actually just now quit the practice, because we felt we were ruining one of our best hunting spots.
In a different situation, my son and I were hunting at another place and I shot a mature buck in a food plot, which I proceeded to drag away from the plot before picking it up. Deer activity was finished for that evening, but then proceeded as normal on our cameras. A week later my son shot a mature buck in that same field, and drove into the middle of the plot and spent a half hour loading it. We didn't have a deer on camera in that field for the next three days after that episode. On the fourth day limited deer activity started again on camera.
There's this deer hunting idea, (that I'm beginning to think is a myth) sometimes passed down for generations, that says scaring deer with mechanical machinery doesn't spook them as much as a human walking on two feet. I will agree that slower or quieter equipment like tractors or fat tire bikes does not scare the deer as much as louder faster (think dirt bike with no muffler) vehicles, and deer act different in different areas, at different ages, and at different times of the season. But I have totally changed my mind about driving in to access a stand. I have become of the persuasion that walking in on two legs is the best possible choice for stand access for hunters.