I like a small glass of straight eggnog with a slice of fruitcake. Eggnog flavored milkshakes are good too.
Eggnog during the holidays is great (with or without alcohol). To reach full perfection, you have to add sprinkled nutmeg on top. I also like eggnog-flavored coffee creamer as a holiday treat, though it seems more difficult to find recently.
I would never, ever just drink eggnog straight, but I love eggnog lattes. Eggnog just seems too thick to drink.