I visited the Falls at this time of year three years ago. There were some tourists about but not many, and lunch right by the Falls actually turned out to be quite a pleasant experience. The restaurant was half-empty, we got a table right by the window,and service was friendly and attentive. I'm sure it'll be different in the main tourist season when restaurant staff are rushed off their feet...

At this time of year you can gaze at the Falls, and you may be able to take a walk behind the Falls, but other attractions - such as the boat rides - won't be available.