For me that would be:
- social skills
- physical fitness
- situational awareness
- first aid
- fire making
- communication (HAM, judging potential connections, testing range of hand held transceiver, CW skills)
- fishing
- archery
- navigation (GPS and old fashioned techniques)
- maintenance for equipment

To stay fit a first aid I volunteered as first responder at the office. As a bonus I get free training and refreshers during paid work time. I also can be sure that the first aid equipment is in good condition.
I recently volunteered as evacuation helper at the office. Once again free training, more knowledge and contact to specialists who give related information generously.