For summer weekends, it's always a good idea to make tour reservations in advance. At slower times, you can usually call the same day or simply show up.
Bus Tours -- Try the Hop-On Hop-Off City Tour offered by Gray Line (184 Front St. E.; tel. 416/594-3310; www.grayline.ca). The good thing is that it goes to such major sights as the Eaton Centre, City Hall, Casa Loma, Yorkville, Chinatown, Harbourfront, the Rogers Centre, and the CN Tower, and a ticket allows you to get on and off the bus over a 2-day period. These narrated tours, which operate daily starting at 10am, cost C$35 adults, C$31 seniors, and C$18 children 4 to 11; free for children 3 and under.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.