We don't expect you to go into full-blown Martha Stewart mode and knit a scarf, but if you baked some heart-shaped cookies, your girl would be pretty damn impressed. Get dirty.
If you made your valentine from construction paper and smelly markers, or spelled out your message of love with Scrabble pieces, you've done well. Just don't take this approach with flowers. Yanking tulips from your neighbor's planter isn't hands-on, it's just wrong. There's a fine line here, gentlemen.