I visited the Canadian side when we were in Toronto. Beautiful, very clean. Was in July, very humid/hot. They were experiencing a heat wave at the time. Absolutely spectacular views, however, NOT to be missed. I recommend doing all the sites (I chickened out for the cablecar ride over the whirlpool, however!). You will not regret any of this experience. It is beautiful, breathtaking, exhilarating, awe-inspiring and unforgettable! If you can stay long enough, see it at night, as they shine lights on the falls and I understand that's quite a sight as well. Enjoy it all, and you will treasure the memories forever.