raynes I think that sounds like a good plan. I'm not not too familiar with Niagara Falls, but I found a map on google and I was going to suggest something similar to what you said.
Tip: you can park at Fallsview Casino for free. If you have one of their free players cards, just put $20 on a table or in a machine, give them your card or swipe it in the machine, and then cash out. It will show that you gambled and when you go to leave the parking garage they swipe your card and parking is free.
ETA: when you enter the garage you don't get a slip, so you could literally park there for days and as long as you have a players card that shows you gambled the day you leave, parking is free. We always do this, even when we have stayed multiple days.