Those are some awesome views from the canyon rim. And the ride down there ain't bad either. Down river in the canyon where your dam view is pointing and the gate is, the road use to go through over to Celebration park and some hidden lakes, which I don't remember their name off the top of my head. I've hiked down in the canyon many times and a Hermit's stone cabin still stands near the river. It's still a great place to visit in the fall and spring.
When I lived near Bowmont, south of Nampa, I use to go riding too, and along the Swan Falls and Snake. From my old house I was able to ride 2-track roads almost all the way. You probably saw many of them on your way. Been a few years since I've ridden down their, thanks for sharing.
I really like the crisp clear view from your camera video. Don't worry about aim during your video's, seems like I'm constantly tweaking. I need a better camera your's does an awesome job.
Do share your chest mount idea. I sorta got one that did ok, but it looked like something Frankenstein would use, so I'm still looking for idea's. I ain't gonna use mine in public. It will scare away the women and children, maybe even the dogs!