I made myself a sort of summer school to keep me productive this summer. I have to do one hour of practicing piano, one hour practicing guitar technique, thirty minutes sight reading, thirty minutes improvising on the guitar, one hour of learning italian, and one hour of computer graphics. I've got to do those five hours every weekday. If I mess up on a day where it was my fault and completely avoidable I don't turn on my computer or TV for the next two days :P