There are a number of good attractions in Niagara Falls. On the Canadian side, take the "Journey Behind the Falls" which is basically a tunnel behind the Canadian (horse shoe) falls. Also, the Maid of the Mist boat ride is pretty cool (and wet). The Aero car (I think they renamed it now) is a cable car that goes over the whirlpool. The Skylon tower, you take a yellow "bug" elevator up to the top and get a great view of Niagara Falls and surrounding area. Friday and Sunday nights they do fireworks at Niagara Falls at 10pm.
Niagara on the Lake is also a nice little town to walk through. A lot of wineries around Niagara on the Lake with tours available.
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