No, we're not talking candy and flowers! Those are about as cliché as it gets on the most romantic holiday of the year. While no girl would turn down a nice bouquet of roses or box of her favorite chocolates, it's time to think outside the box!
For example, you could buy her a piece of art! Take her to an art museum and pay attention to which pieces she loves the most. Then, you can find a less expensive print of said art and give it to her for Valentine's Day. Not only will she be floored that you remembered, but you'll already know she likes it!