For me, the key to productive, contented living is decluttering.
Lifeseems to default to an excess of possessions, activities and pursuits. It takes intention and effort to organize a distracted state of living into one that is simple and peaceful. Decluttering involves making do with the minimum required to achieve your goals, and systematically winnowing out what isn't earning its keep.
I apply decluttering to every aspect of my life. Working at two clinics had introduced unnecessary complexity to my week, so this summer I resigned at the HIV clinic to exclusively practice refugee medicine. I focus on three hobbies: gardening in summer, knitting in winter and photography year-round. No one looks inside my closet without remarking that it's the most pared down collection of clothes they've ever seen . . .