Here are some sites with ideas for a Do It Yourself (DIY) Valentine's Day. What could be more romantic than doing everything yourself. Showing them you cared enough to put in all of that effort. Here are examples for crafting/diy and food.
60 Best Valentine's Day Crafts to Help You Spread the Love
54 Easy Valentine's Day Crafts That Are Creative and Full of Love Must See Valentine’s Crafts for Kids
46 Fun and Easy Valentine’s Day Crafts for Kids