My daughter and I spent a few hours at Niagara Falls we arrived late in the afternoon yesterday and left mid-morning today. I went out to shoot after we arrived, at night and early this morning.
Here are two views, done on my laptop, so I don't know how these really look...
The Falls illuminated with coloured lights at night; the shot is of the American Fall and the Bridal Veil Falls. I know a lot of people don't like the blurry, long exposure look, but frankly, it's tough to do anything else with so little light...
Water plunging over the edge - The Canadian or Horseshoe Falls