1) Stay comfortable----good stand, dress right (you can always take clothes off but you can't put them on if you ain't got them)
2) Pack some snacks and water----i know many who drink coffee but I can't stand the stuff[:'(]
3) For me I need something to entertain me during those long stretches. Like said earlier watching a squirrel, some birds, playing some kind of game, reading a book,anything. This year I have a smart phone with internet access for the stands that I have service on....i think huntingnet.com might be to big of a distratction though.