The Ottawa Riverboat Company offers a 90 minute cruise of the Ottawa River passing the most significant sites of the city. Other tours are also offered.
Paul's Boat Lines offers cruises along the Ottawa River and the Rideau Canal system. This can be a good option for seeing some of the sights of Ottawa.
The Ottawa River cruise lasts about 3.5 hours, and the Ridea Canal cruise takes about 1.5 hours.
Tips: Costs vary depending on the cruise, and combination tickets are available.