My brother made a comment at lunch that reminded me of earlier thoughts about preparing for the collapse of civilization. I don't think it's imminent, but you can never be too careful. So on that note, what kind of planning can you do to prepare your body? Among the procedures that would be important to receive before civilization collapses are the removal of wisdom teeth, lasik eye surgery, appendectomy, and possibly sterilization (particularly for women who don't want to give birth with stone-age medicine).
Assuming you can't take any physical objects post-apocalypse, what other preparations could you make? I'd learn more chemistry, botany, and mechanics.