Oh boy, getting mail brings my day to a whole other level when I am away at school. In the midst of my daily routine and scrutinizing studies, it is so nice to receive friendly cards, care packages, etc. Make sure that you let your family and friends know this, so that they will keep them coming!
Better yet,
set the precedent by writing letters to your family once you get settled in and, hopefully, they will return the favor. It can make such a difference to keep in touch with family...