Growing up less than two hours from the falls, every time a relative from Europe came to visit , I'd get dragged up there. argh.
The Canadian side , is nicer, more attractions. Take the elevator under the falls. You can walk the tunnel out and get behind the falls.
The Maid of the mist, is cool, if you want to get wet.
Several neat walking view point along the rim.
Lots of places for the Mrs. to shop and spend $$.
I know the larger tour operator fly's 407's. I'd rather ride in that than be squished in a 206b
RB