Le Saint Tropaz on King Street is quite nice. As is Venice, for Italian food.
Big Daddys is good if you like cajun, also too along John St, north of King there is Alice Fazooli's.
Alot depends on what your tastes are and what you are looking to spend.
The restaurants I mentioned have all been places that I have taken clients too and all have enjoyed.
If you like, you can give me more details on your tastes, and how far you want to go and I van give you more ideas.
A few years ago, Hys steakhouse under went a major reno and that is quite nice, but expensive.
Depending on how much time you have and how much you want to walk or travel, there is a great little place right near University and Dundas, that serves great steaks. I think it is on Baldwin.