Valentine's Day is for singles too! It's a day to openly express love, so it doesn't have to be limited to couples only. Instead of spending money on flowers, chocolate and gifts for someone else go ahead and treat yourself to something special. A facial or massage comes to mind at the moment. Or go ahead and buy those flowers and chocolate for yourself.
Valentine's Day is also a nice time to remind or let your family and friends know that you love them. My kids pass out Valentines to their friends at school, I think thats a tradition that should be carried on to adulthood.