Just have proof of registration/ownership. They generally don’t check it but may ask you if its your boat.
When on the water the MNR will check for these things :Make sure you have a fire extinguisher, a paddle of some type (I prefer collapsible), throwable cushion, and a Canadian boat kit. I believe You can still get those at Fleet Farm. They consist of a floating rescue line, pea less whistle, the container it comes in county’s as your bailer, and there may be a few other things in it.
I would be more worried about passport stuff being in order than anything. No live bait except for crawlers in artificial bedding.