Visit New York (Intrepid Sea, Air, and Space Museum, New York Stock Exchange, One World Trade Center, Statue of Liberty Cruise, Times Square, Wall Street), Niagara Falls Canada (Skylon Tower), Niagara Falls (Maid of the Mist, Niagara Falls Adventure Movie, Niagara Power Vista, Whirlpool State Park, Touching Niagara Fall Tour), Toronto (Casa Loma, CN Tower), Watkins Glen (Watkins Glen State Park).
About 20 hours in total at Niagara Falls
Experience tour guide
Into Canada side to see night view of the Falls and get on the Skylon Tower on own expenses (valid visa needed)