Hi there!!
there is TONS of stuff to do in Niagara Falls. First off, I would just google Niagara Falls tourism and start looking.
There is a main street in the tourist area called Clifton Hill. There, you will find tons of stuff to do. There is a large ferris wheel. HUGE. Climatized as well. So, runs with A/C. love it

Get a couple of spins around that. But def do it at night, when everything is lit up. Certain nights there are fireworks, I just forget which nights. I know Fri nights there are. But there is also anothere night they do them
There is a
Lego area, kind of a walk thru play area. 3 or 4 of the 3D or 4D movie rides. A HUGE arcade area. There are 2, maybe 3 wax houses, with statues of famous people. They are pretty cool. Kids love them. Haunted houses, from flipping scary to tame. Build a bear stores. Candy stores.
There is the big Hershey store there, that I certainly wouldn't miss out on the candy inside, is certainly to die for
Then there is the butterfly conservatory. All the 'parks' places.
I thing I do suggest is getting 'fun packs'. Where you buy multiple tickets at once. Gives you big ssavings over buying individual tickets. But google it. Will give you lots of info for what's down there, the fireworks and even music that is going on.
Hope this helps!!! Enjoy your time
