Fried Chicken and Sushi 251 Working as a black man in Japan

Looks like working in Japan can have its perks too!  Yes, it can be frustrating at times but teaching English as a foreigner can mean that people expect less from you.  I remember feeling like I had so much time during the day at school.  I would come up with things to do at my desk like reading, drawing and occasionally grading papers.  What do you do to kill time in-between classes in Japan?