What I love about skateboarding is that it is almost impossible to let your mind wander to work related thoughts - you are totally consumed with the next few seconds of your life.
I still can't do any tricks, but I find rolling back and forth on the ramp doing the occasional FS and BS kick-turn incredibly soothing.
In short, collecting.
I suppose any type of immersion in a collectible thing might do the trick, but for me, it was both collecting the books and reading them that took my mind off burn out (and a troubled personal life).