Bouquet & Card
Get a nice bouquet of mixed roses and other flowers to enhance it.
(Originally I had bought a dozen roses, with smaller white flowers and a flower that had red colored tips, and faded into a pink and white toward the center.)
Then get a card telling her that she's the one, and how much she means to you. Tell her why you love her and tell her your going to be there for her. Unless you don't mean it ;)
Then when you go home put some rose petals around your room and light some candles for the night =)