I bought a new waterproof camera this week. I already own a GoPro, but its waterproof housing meant that audio always comes out muted and distorted. So I went looking for a camera that was waterproof in its own right, without a separate casing, to be able to take video with quality audio. I settled on the Panasonic Lumix TS5, as a number of reviews said it was excellent for video. Plus it's been around for a few years now so I was able to get it a decent sale price.
I went for a paddle through the Toronto Islands yesterday to try it out, attached to the kayak with a suction cup mount. I'm very, very pleased with it. I took an hour's worth of video and the battery was still going (although near the end), and the video and audio quality were both great. So it's coming on my next camping trip (soon!), and I think I'll put together a video trip report as well as a written one when I get back. We'll see how it goes. Just need to buy another battery or three first...