Michelle & I have been to Niagara Falls twice now. Once in the middle of winter in 2003 and then very recently when Mum came over from Australia. Niagara Falls is a great place to go to. While we didn't look around the USA side, we have been told by countless numbers of people that the views on the Canadian side are much better.
Shown here are views of the Whirlpool Rapids and the falls at night. You can also see The Lady of the Mist boat in a few of them, and I took a few photos while I had the chance. During the evening the falls are lit up with some colorful light displays which change colors throughout the night.