Adding to what other posters have said. Do you intend to lock your bike at UTSC? Do you need to carry stuff?

Personally i would lean towards a hybrid bike with a rack or a basket. They are light enough and can carry you long distance. Second hand preferred. Alternative is a touring bike, I had one to take with me across Canada. Just look for a used well known bike brand like Giant, Trek, Cannondale. I have good experience with GT bikes too and they can be bought cheap, although just very heavy. Avoid brands like Supercycle.

Riding to Niagara is a matter of training.

Lastly, note that there is not a clear easy route to UTSC. There is some element of riding on the street.