I've had a lot of concussions. So I have a personal multi sport helmet by Pro Tec. One of their skate helmets with lots of air vents due to my climate. I've worn it quite a bit in all sorts of adventuring from bouldering, to atv's, to horseback riding. B/c of my amount of concussions and the thought that the more you have the easier they are to receive (a theory I subscribe to), I even wear it when climbing a ladder.

Recently Pro Tech started selling a line of military helmets that provide rails for lighting and NVG. As a GOPRO user I may pick up one of these for a more stable camera platform.