I substitute teach at the high school level and it is great. I show up, pop the movie in/read the lesson plan to the students and then kick back and read a book/magazine/newspaper. I give the school my days off each month and if they need me, they call on that day. The nice thing is you can always say NO.
Oh yeah, and did I mention how much older high school girls look these days?

Disclaimer: Only the ones that are 18!