These apply whether you're in a relationship or not:
1. Wear red or pink (or purple I suppose): These festive colors are linked to this romantic holiday, so show your V-Day spirit with fashion! It's like St. Patrick's Day and green: they just go together!
2. Eat candy: Of course chocolate is the assumed candy for Valentine's Day, and it comes in many forms. You could enjoy a variety of candies in a Russell Stover box, nibble on some little Dove chocolates with love notes on the inside of the foil, or indulge in chocolate-covered strawberries. But I do know of some people who don't like chocolate (gasp!). So those people get conversation hearts. Sorry: that's what happens when you don't like chocolate.
3. Pamper yourself: Take this to mean what you wish. You could enjoy a candle-lit dinner with your sweetie, give yourself a mani-pedi, take a luxurious bubble bath, whatever suits your fancy.
4. Call/Text/Email your loved ones: Valentine's Day isn't just for lovers! Call your parents, grandparents, siblings, college friends, etc. and let them know you're thinking about them on this special day! Everyone likes to get some extra love during the holidays, and even the simplest gestures can mean a lot.
HAPPY VALENTINE'S DAY, EVERYBODY!