As far as actual hands-on skills go, off the top of my head:

Firecraft
Knifework
Knife sharpening
Knots
Map & Compass nav
Water purification
First Aid
Shelter building
Signalling (have you practiced with your signal mirror?)
Sewing

Experience on how to dress & regulate layers to stay warm/dry/cool. Be in the habit of drinking often to stay hydrated. Know the signs of hypothermia/frostbite/heatstroke.