Mildred Pierce has an excellent brunch. Queen and Dovercourt about 10 minute cab ride from the Sheraton. Or about 25 minutes or so on the Queen streetcar across to Dovercourt and walk down Lisgar.
http://www.torontolife.com/guide/res...ildred-pierce/
Niagara Falls is not know for its culinary dishes. If you have a car, I would recommend driving to Niagara on the Lake and trying a winery for dinner. I highly recommend the Stone Road Grille (make reservations though). Use the above website to search "Niagara" in the restaurant section and it will provide you with some recommendations.