I've never actually walked the Niagara gorge, even though I live 20 minutes from it. Anyway, I walked from Devil's Hole to the Whirlpool and then back to Devil's Hole. Awesome workout. I didn't take my camera because I forgot to bring my backpack, so carrying it would have been a nuisance, but here's pictures from when I got back:
You actually get really close to the water, and you notice how quickly it's moving at that point. There are some parks where you could slip...and die. Not particularly a great idea. Fun though. We're going to do the Canadian side next.