I guess the biggest thing that I would say is to mentally prepare myself for the season. Figure out what is the best design for a past years game and see how well it might have preformed. Kind of like a mock build season of the mind (only because our team does not do to much off-season stuff).
Other than those:
-Sleep
-Learn Inventor
-Sleep
-Learn how to use a few machines better
-Maybe homework
-Sleep a bit more
