Get a very large SD card (32 gigs or more) and a couple extra batteries (which you already have), then record EVERYTHING. Trying to turn on/off depending on what might be good footage is hard, it's much easier to just record non-stop and edit out everything crap. There are ways of finding the "good stuff", I particularly like the "Highlight Hunter" app:
http://highlighthunter.com/
Basically when recording if something interesting happens and you want to be able to find it later, you just cover the gopro lens with your hand for 2 seconds. The "highlight hunter" app searches for these periods of black and will extract prior segments based on your setup criteria (ie grab 5 minutes of video before every blackout).