well, for one, get her roses, doesn't have to be a lot, it can only be 1 rose, maybe a little teddy bear, do something sweet, bring her to a beach and just walk around, go to a park and just chill, no need for love poems or anything, but if it's from ur heart, go for it... tell her how beautiful she is...~thinking of more~
edit: ah, yes, little notes once in a while, just a little hello or "how's ur day" that kind of stuff