We went just last weekend. We also stayed in Ontario. Hornblower cruise is on the CA side of the falls. Also we purchased a groupon for Rainforest cafe at the Sheraton in U.S. I don't remember the expiration for that, but I believe it's still on groupon. Or you could purchase McCormick and Shmicks gift cards at Costco for $80 for $100 to use at Rainforest Cafe Canada side. Be warned though the Rainforest Cafe at the Sheraton on the U.S. side is not owned by Landry's, it is owned by the Sheraton. So I wouldn't try to combine and use both deals at the U.S. Rainforest cafe.
I wish we had time to go to Toronto, I hope you have a great trip!