Not to set your expectations too high, but Niagara Falls is a real life Disney World.
When you go down to Disney World in Florida, you go into manufactured reality. At Niagara Falls, you are actually seeing the real thing.
Image: Niagara Falls Adventure Pass
The Niagara Falls Adventure Pass combines a number of attractions together, so you can save money. I bought this pass online, before heading up to Niagara Falls, and after using it, I feel that it is a good deal.
The first attraction we went to was the White Water Walk.
It's explained this way in tourist talk:
Take a walk along a boardwalk at the very edge of one of the world's wildest stretches of whitewater! Marvel at the relentless power and beauty of nature; see how the Great Gorge was created.the walk was really fun, and we were there during the Fall season, so the colors were really beautiful.
Here's a video to give you a feel for the power of the rapids:
Here are my photos in a slideshow: