You could do a nice card and some flowers, or a card and some chocolate, if you're older, some jewelry. A nice romantic dinner, a good movie and popcorn snuggling under a blanket, or the best thing ever....Just your time and a simple I love you!
Women like flowers, pendents, bracelets. You can choose something with heart symbols or some item in a form of a heart. For instance a wristwatch in a form of a heart or with love symbols.
Hehe I'm late on answering, so, Buy EVERYTHING on clearance!
And next time rent a movie and share a big tub of her favorite ice cream