One of my favorite games to watch was "If You Love Me, Baby, Smile."
We also handed out valentines and probably ate too much of our traded candy (although sugar was not given out by the teachers). Some of the students had fancy valentines boxes!
Oh, and earlier in the month, we made some stuffed hearts to hang in the windows. Students used a crayon resist technique with a watercolor wash on construction paper. (You know, use crayons first and then paint over it, but the paint runs away from the crayon.) They cut 2 matching hearts out of the paper they had decorated. Then, I taught them the blanket stitch, and they stitched around the outside of the heart. We stuffed them with old plastic bags, punched a hole in the top, and hung them from varying lengths of ribbon.
I liked watching the hearts dance about in the windows as air circulated through the classroom.