A couple of tour operators offer a similar double-decker guided tour. They last two hours and include at least 20 stops (this company has 21 stops). City Sightseeing Toronto is the only one offering a boat ride as a bonus (and your pass allows you to step on and off the double-decker during seven consecutive days). These rides are meant for tourists but I decided to try it because my young son was really fascinated by buses and I knew he would appreciate this ride. "I have not had a good hair day since I started this job" claims the tour operator. I believe her. As we drive under the Gardiner, we feel quite a draft! I discovered there are a few things you can only see from the top of a double-decker: the top of the TTC buses and a close-up of the traffic lights. You get to see many of Toronto's landmarks from a different angle and you're allowed to hop on and hop off as you wish (as long as you move forward) at any of the stops. Just make sure you know the time of the last departure from that stop. You can present a prepaid voucher at any stop to hop on.
As of May 2016, some points of interest featured in City Sightseeing's tour: CN Tower, Casa Loma, Eaton Centre, Yonge-Dundas Square, Harbourfront Centre, Royal Ontario Museum, Art Gallery of Ontario, St. Lawrence Market, The Distillery District, Hockey Hall of Fame, City Hall, Bata Shoe Museum, Gardiner Museum of Ceramic Art, Theatre District, Chinatown, Kensington Market, Bloor-Yorkville, Queen’s Park, Entertainment District, Club District, University of Toronto, Baldwin Village, John Street Roundhouse