Most women are generally very historical with everything...or my wife is...she remembers what I wore, where we ate, all those kind of details from all our dates etc.
Plan a special evening, whatever that would be for you, i.e. dinner, movie, long walk, whatever it is, pay close attention to every detail as that will show her you were thinking of her. Perhaps dress up nice, get a haircut, clip your nose hair, trim your eyebrows, whatever...go out of your way to make her feel extra special in every aspect.
You might try going back to the place you first met, or the place of your first date...for my wife it is the effort I put forth to show her how much I love her that she appreciates most.
