Seeing as we work our butts off all year, many of us simply do nothing. We golf, vacation, visit family, clean relax and whatever else you can think of. About mid-August we go back and prep for the following year and refresh ourselves on the program of studies or any recent changes. The division I'm in also pays teachers extra to work on science boxes for different units. We stay in "work mode" most of the summer, often visiting the school and taking part in professional development. There is always school stuff to do for good teachers! I am a first year teacher so I am looking forward to this time to reflection my year and prep for year 2. Good question!