In general, especially as there's no mention if you're a seasoned backpacker or not, you'd kill 2 birds with one stone by doing at least one pre-season scouting trip, mimicking your intended 3-day backpack hunting trip.
A scouting trip without the complications of a hunt will help break you in, but more importantly, it'll mentally prepare you for the actual hunt, and give you a game-plan that will have you executing during the hunt, not trying to figure out what to do on the fly.
The key thing with deer is food - that's why people are suggesting burns and cuts above. Dense forest is often pretty poor for deer food due to the canopy crowding out the sunlight. But recent burns and clear-cuts leave large areas of the forest floor to sunlight, which brings up lots of deer food. That brings deer. And deer are habitual - they typically follow the same set of trails over and over.
E-scout with OnX to find cuts and burns in those areas of interest you want to explore, then spend 1 or 2 of those three-day trips to scout out those places on the ground. First trip is largely scouting access for your vehicle to best set you up for going on foot, and scouting out your promising sites for deer sign.
It's literally this simple: walk along the treelines of cuts until you find deer trails with clear deer sign, mark that spot on OnX, and continue on to the next one, following that tree line. Gather that data to start formulating a game plan, based on highest traffic and finding a spot for you to glass that location from. Pay very close attention to the prevailing wind in these areas - always, always be downwind of your target site. You can fool a buck's eyes and ears sometimes, but you'll never, ever fool their nose.
You can easily spend a day or two on just a couple of cuts doing this. But each morning before sunup, be in-place glassing over your more interesting trails entering and exiting that treeline. Never skyline yourself, and try to break up your outline by being in a hide of some kind, even just behind a bit of brush or rock.
