Upvote:1
The supporting documentation for the visa application makes it clear that the itinerary and associated documents are optional.
You should submit any documents on this topic you already have. For some, it makes no sense to not provide them: for instance, if you are going for a conference, giving details of the conference is definitely something you should do. If you intend to stay with someone, you should provide the relevant details.
If for whatever reason you have already made reservations, include the details. Otherwise, giving the broad lines of your itinerary, both how you get to/from Canada and what you will be doing there is a good idea: it shows that you have researched the topic, and allows you and the immigration officer to make an estimate of the associated cost to see if that matches other answers and documents and your financial situation.
The more a accurate and consistent the picture you paint the better.