My brother lives in Toronto, and we love to visit. What a wonderful city. Here are some things we enjoy.
I can’t remember where some of these restaurants are, but perhaps a city directory would help you with that.
Queen of Sheba - Ethiopian food; delicious and immense amounts for oh, $6-8 per person
Li Garden - in the heart of Chinatown; truly excellent, with a mostly Asian clientele, which I always consider a good sign
Korean Grill House - 214 Queen St. W; the tables have little grills in the center, and you cook your own meat; great fun, and there’s an all-you-can eat option if you’re really hungry
Queen of Tarts - 283 Roncesvalles; not a restaurant, but the best bakery I’ve ever been in; world class tarts and cookies; my brother lives near there and we go every time we visit - the whole Roncesvalles Village area has fun shops, in fact
If you like old interesting buildings, you might visit the Church of the Holy Trinity in Trinity Square, right next to the Eaton Centre. It’s been there a really long time, and has an interesting history; half of it burned down at some time in the past, so the stained glass is different on the two sides of the church. The building is also noted for its incredible acoustics - artists like the Cowboy Junkies have recorded Trinity Sessions in the church for that reason. It’s open every day from 11-3. There’s also a meditation labyrinth outside the church, if you’re into that sort of thing.
You might also ask about Centre Island. You have to take a ferry to get there, and if I remember correctly, cars aren’t allowed on the island. There are homes there, but there is also a park. We were there in the summer, so I’m not sure what it’s like this time of year, but it’s worth asking about.
My 8 year old niece is obsessed with getting us to the CN tower, although we always have other things to do and haven’t yet made it there. There’s a restaurant at the top that is reputed to be wonderful, if somewhat pricey.
There’s a shop called Peach Berserk in the fashion district (507 Queen St. W) that has totally funky and fun fabrics and clothing for sale. The owner screen prints her own designs on silk and designs her own clothing as well. I, unfortunately, only own a scarf, since it’s all I can afford! Fun to look at though, if you have some time to kill and you’re in the neighborhood. Even if you’re poor like me. 
Okay, I’ll stop now. But if I think of anything else, I may pop in again.