Upvote:2
It's probably not necessary to have specific travel plans, but it will be helpful to have a general idea of what and where you want to visit (for instance, "I want to spend a day visiting the Vancouver Aquarium and another day visiting the Vancouver Art Gallery").
Canada consular officers aren't looking for specific travel plans anyway, and most countries advise visa applicants to not finalize travel plans before a visa is approved anyway.
As a frequent business visitor to the US, it should be very easy for you to prove these.