I qualify for a government rate so that is usually my best option at the Sheraton. I did have a points stay at the Sheraton last month and am 99% sure there were no charges on the folio.
The Sheraton website
www.sheratonatthefalls.com has some packages that include extras not found on Spg.com. I don't book these often but I have it in writing that they qualify as spg stays. They just may not qualify for promos that require booking on spg.com or the app.
Enjoy your trip! I will be at the Sheraton Sunday night.
I will send you a PM with 2 contacts at the Sheraton you can ask any questions.