The wax museum, the museum with mummies and wolves, a shrine, Fort Niagara, Grand Island...and of course, the roar of the falls. Great place...
The only time we ever stayed in a hotel as kids, was when my parents took us to NY City on the train. We'd catch the midnight train out of Rochester on a Friday night, and get into NY City early the next morning. We'd eat breakfast at the auto-mat, then walk around the city until we could check into the hotel. We usually stayed at the Hotel Piccadilly or Edison Hotel overnight Saturday. We thought it was a treat to be able to watch the old horror movies on the black and white TV's in the hotel room. Then we'd take the train back home on Sunday.