There are certain foods I always eat/serve, like eggnog, fruitcake, candy canes, etc. I also make a lot of cookies and candy to give away.
We're not big on gifts, but I always play Santa and fill everyone's stocking.
There's a list of songs and movies I always have to revisit.
Shiner's Holiday Cheer and Sam Adams Winter Lager, plus whatever other festive beer I come across.
I always buy at least one new ornament a year.