If it' s only forty acres and you are in good health, by all means hoof it in. Probably a pretty easy walk on the farmers road anyhow. Personally, I have always been very leary of creating a situation the deer are not used to and messing them up. The deer are probably not used to your vehicle for one, and driving a vehicle on that road in the dark is going to make a lot of unwanted noise and greater chance of spooking deer in my opinion. Just my two cents worth.