i'm in southern ontario. There are lots of great locations to paddle, including many on crown land where there are no fees for primitive camping.
I tend to lean towards georgian bay trips when i have 3 or more days. While there are days the bay can be rough, you can usually find areas around the islands where great flat water paddling can be had.
I'm not into doing paddling trip reports, but heres one online you could read thru.
There is a paddlers group called GLSKA that paddles the bay frequently. They are online.
If you want more info about where to paddle, launch, etc. drop me an email.