Sign should be acurate - The Falls were great. However, as a public park the information you forward should be accurate. The picture of Niagara Falls that you show, is in Ontario, Canada and not in New York.
Bring comfy shoes - This is one of the neatest places that I have every been, but bring comfortable shoes as there is much to see and do, The day we went lava was flowing but it was a 8 mile hike to see it, sadly we were not prepared. Check with the rangers when you arrive they are a wealth of information.