When I was in Iceland for my honeymoon, we were talking with the B&B proprietor about Gullfoss. He said to be careful, since there is no retaining wall or barrier; you can walk right up to the edge. He also said it eats ~5 tourists a year.
What does my newlywed wife do as soon as we get there? Walks on the mossy rocks right up to the edge to get a better view.
I love my wife, but damn.