I do nothing at all. I intend to sit at home doing homework, occasionally calling a few friends to bother them when I get bored. That is all.

You however should just spend the day with your girlfriend doing whatever you feel like. Be nice the whole day and eat a whole bunch of chocolate. Maybe get her some flowers if you want to look like the traditional guy. Just be nice and do anything that doesn't include fried foods, fast foods, annoying people, or vomit.

GET HER A TEDDY BEAR! Those are cute and cheap. Jewelry is cool too...if you've got the money to actually buy it. If not, a little teddy, some candy, and maybe flowers should do the trick. But take Meier Link's advice if you really want to impress her.