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There are tons of fun things to do in Niagara Falls, but if you are only going to do one thing during your visit, make sure it is visiting the Observation Deck at the Skylon Tower. The Skylon Tower gives you an amazing view of the Falls that you cant get at any other Niagara Falls Attractions.
You get to witness not only the Falls but also the Niagara wine district, the dazzling cityscape below and the beautiful skylines of Toronto and Buffalo. Every Niagara Falls vacation must include this Niagara Falls attraction.
Source link: http://www.skylon.com/best-view-of-niagara-falls/