Baking. I worked briefly in a bakery in the 1980s and there is something about the midnight shift, making the bread for the morning. I know its an unhealthy lifestyle.
I know a gypsy brewer who now runs his own microbrewery. I'd haul sacks all day to be part of the cycle of a complete brew to keg.
We spend far too much time in our heads online in the ICT business. I'd use my free summer to learn how to integrate body and mind.
I'm at the back-end of my working career btw.