"Rol San" on Spadina (close to Dundas) for dim sum

Sichuan Garden on Spadina (close to College) for excellent spicy food. Asian Legend on Dundas for westernized Chinese food.

You could take the buses from Safeway Tours to Niagara Falls--it's convenient and cheap: http://www.safewaytours.net/

I live in downtown Toronto and feel very safe. If you are staying close to City Hall, there should still be many people on the street at 9/10pm.