If you're moving into an on-campus accommodation or a new apartment, you'll probably have to deal with a pile of paperwork before you have any chance to settle down.
Once you've made it to your new home in one piece, I'd suggest taking a quick shower – nothing is more satisfying after a long plane journey – and then before you think about the mammoth task of unpacking, go out for a walk.
You may have been cramped in that airplane seat for more than 12 hours, and your muscles will still be stretching out. If you're staying on campus, wander around. If you're in a town or city, see if you can find the local shops.
Getting some fresh air and exploring your new surroundings will go a long way toward making you feel human again after some long-haul traveling.