Use a go-Pro hero3. I found the battery life is only good for overnighters. Anything longer would require extra batteries or a way to charge while out and about.
Here is a link to the first use of it and the fun mounting.

https://rebaontour.wordpress.com/201...opro-practice/

I like the random picture taking and the video mode. The sound is a little harsh in video mode (all you hear is bumps and wind).
Still really trying to figure out how to use it. Sometimes it works great. Others not so much. Sometimes I find it more trouble than it is worth. I guess I just need a little more experience.