Is it good to go Toronto for travel?

Me and my boyfriend are planning to go to Canada for travel.

We will go there from Korea and UK separately.

We just picked Canada randomly using roulette.

And Toronto 5days, Montreal 4days, New York 4days and back to Toronto spend 2days (out base is Toronto)

I believe the time in Toronto might be long.

How you think about it?

I’ve never been to America.

I need your advice thank you.