I experimented with a Go Pro at one time, but it ultimately went back to REI. I think the biggest issue that you'll run into is battery life, especially using the wifi remote.

The other issue is the amount of "processing" one needs to do to produce usable/watchable video. You might notice that in the Go Pro commercials, most of the footage is in slow motion - there's a reason for that. At actual speed there is so much camera movement that the video is generally not watchable.

I was using it while walking and hunting; it might be somewhat better if strapped to a canoe, and better yet if you're only trying to capture stills and not video. But I'd expect every frame to be tilted one way or the other with the canoe's movement. That was my experience, YMMV.

Ranger