Recess is an American word for when you get to play outside during school. It was one of the best parts of school, because you could just do anything you wanted outside. Recess was mandatory unless you got into trouble, and then your punishment was waiting inside or sitting next to the teacher and watching everyone play. A cartoon was on television years ago called "Recess," and it followed several main characters during their recess adventures. Here's a youtube link to a Top 10 Recess Episodes clip:
I think the context of "miss recess" is important here to figure out the meaning.
Here are two:
1.As an adult, I miss recess, because I remember it as a time when I had a lot of fun. I wish I could have recess again!
2.As a child, I would often miss recess, because I was naughty, and I had to sit in the classroom doing work instead of playing with everyone else as punishment.