Above is the video from a trip I did to McCraney Lake in Algonquin Provincial Park. We launched our canoe from the Rain Lake access point, and paddled up the river until we arrived at the first portage which does not take long to get to.
The portage is 1,800m but it is well maintained and perfectly flat. There is a short paddle after the portage in Little McCraney Lake to get to the beaver dam lift-over into McCraney Lake. You continue to paddle down the narrow winding river until it opens up to the larger section of the Lake. There are a total of 8 campsites on the lake and 2 of those are on the island.
We had some good fishing on this trip overall. We didn't spend a whole lot of rod hours in the boat and still managed to catch a collective 9 Lake Trout for the weekend between the group. The water was deep and we were pulling up Lake Trout from water over 70ft deep. There were a few other groups on the lake with us but because the sites were fairly spread out, you could barely notice it.
I would say this would be a good beginner to intermediate trip and a great test for longer portages. If you are thinking about doing some longer portages (Over 1 km) this portage gives you a taste of distance while staying very flat. I highly recommend you add this to your to-camp list.