One thing different about Aeroplan’s reward booking system is that there is a tab which allows you to enter a free Aeroplan reward stopover city and choose how long you want to stay in that city. An option not seen in other reward booking sites. This stopover can be used to save you a bundle of points. Here are some sample itineraries which were booked with no extra points required for a stopover. Essentially, you can fly to two different cities for the redemption value of one city.
A round trip flight from Vancouver to New York City with a stopover in Los Angeles:
A round trip flight from Vancouver to Paris with a stopover in London: