Good thread and ideas.
Just in relation to night filming - Someone mentioned in another place that night filming should be done on less FPS (if you think about it, on a camera you use longer exposure to capture low light) so I tried switching from my usual 60fps to 25 - and wow what a difference - MUCH less grainy and better footage
Just use night mode on the GoPro. It swaps to 30fps in low light automatically.I just posted a video that shows the GoPro Hero 4 at night using 24 fps. I'll go to 30fps next night video.