A beautiful alternative to Niagara is Websters Falls in the Spencer Gorge at Greensville...
There are plenty of beautiful picture opportunities to take as well as relatively safe hiking trails as well.

And of course if you are into Sightseeing on the ground level and up perspective, there is an Antique shop close by and the Hamilton Farmer's Market. History lovers, will find the Hermitage Ruins interesting as well as the Dundurn Castle, which I have yet to see inside!! Of course the Royal Botanical Gardens, but I prefer the hikes and historical places.
You might see other earlier shots (winter) on this blog when I was here last year!