When you visit Toronto, you have to tour Niagara Falls. This spectacular water falls is only 75 miles from Toronto. It has the greatest water flow of any water falls in North America. Niagara Falls is an easy day trip by car or a one day bus tour. If you want to spend some time, there are many hotels, casino and other sites. Its also a great winter destination. The mist from the Falls creates great ice formation.
The last time we went, we stayed in a hotel with a view over the Falls, ate at the rotating restaurant, and lost a bit of money in the casino. Enjoy!