I thought that the Journey Behind the Falls would be an amazing experience. I was somewhat disappointed. It was very crowded which we expected, but we all felt packed into the walkways/tunnels. You could go right behind the falls and there was a fence like thing to prevent you from going too far.
At the one end, there was an area where you could walk out and look at the falls from the side. Additionally, you could see the American falls as well. That part was pretty nice and we took a lot of cute pictures there. They give you these rain ponchos to wear so you don't get completely soaked.