The Canadian side is mostly a shitty tourist trap and a lame casino, but it’s definitely worth a day trip to see the falls. The Hornblower boat trip (Canadian Maid of the Mist) and the tunnels behind the falls are really cool, although a bit pricey.
Definitely recommend staying at one of the BnBs at Niagara on the Lake and popping over to Niagara falls for a day, because staying in Niagara Falls sucks. There’s one BnB I stayed at a while ago called “The Tea Cosy” I think, if it’s still around that place was great. Owners are a super sweet older couple and the breakfast was delicious.