Elora Gorge
This short section of the Grand River provides a rare opportunity to run whitewater in this part of Ontario. Just under three kilometres of paddling from the put-in to the takeout makes this a quick paddle if you cannonball it, but you can stretch it out by stopping to play or practice skills at the many features.
In addition to the rapids, this is a stunning environment. Limestone cliffs with springs trickling into the river below, where kingfishers and herons look for a meal. Forests surround the river for the entire stretch. A pair of Bald eagles nest shortly before the takeout and can often be seen perched next to the river.
The Grand upstream is dam-controlled so it has a pretty reliable flow. There are a couple spots that can get scrapey when the flow is on the lower side, but it's all runnable.
There are a couple of things to note about this stretch of river:
Being a gorge, there are few places to get out before the takeout. Every year, the local fire department has to rescue a few inexperienced paddlers who get stranded after losing their boat or otherwise freaking out.
Being a gorge, the water does not spread out. When there is a dam release, such as after a big rainfall, the extra water forced between the limestone cliffs can become a wild ride. Go with someone who is familiar with the river in these conditions.