Whirlpool Aero Car - Niagara Parks, Niagara Falls, Canada (Cheesy: don't buy the aero car ride, you basically get the same view from the edge. One person I asked said that it "looked more like a whirlpool from the edge.
Niagara Falls, both the U. side and the Canadian side. Winter everything is covered with ice and snow -- and you can always find new things to see and do! It's an amazing (and VERY romantic) place to visit!