They also offer the Maid of the Mist boat cruise which will take you to the whirlpools and bottom of Niagara falls. The water flow on the American side of the falls is much less in strength because of Goat Island, whereas Horseshoe Falls has no obstruction to divert it. The view of Niagra and Horseshoe falls is breathtaking. Be prepared to get soaked and keep your cameras covered.
Whirlpool Rapids is down river a bit and you can take a power boat ride through the rapids its great fun. At the bottom of Niagra falls, the water travels 15 miles over many gorges and whirl pools to enjoy. The guides will tell you of the great history of Niagara falls and how they were formed.