By having a sleep over, of course.
We painted paper mache boxes for the parents, and then filled them with cookies and chocolate covered strawberries. We made heart shaped pizzas and had salad for dinner. We had hip-hop dance offs, silly string wars, and watched a little TV. We made cards and valentines. We made a huge bed that covered the entire living room floor and "camped" out. For breakfast, we had eggs, bacon, hashbrowns, and heart shaped biscuits. We went to the park and played on the toys and climbed the trees.
It was a lot of fun and everyone was really good the whole time!
Here are the pictures we took along the way!