Depends on your skill level and how fit you are. 
This from Nokimis trail in Lake Superior P.P.https://goo.gl/photos/7ZKEweWMW9cWzYFU6
There are many harder and some overnighters.
And the view from Neys to a Lawren Harris location, stunning at sun set.
https://goo.gl/photos/bHG96vSYk2KfvYrx8
and you have not even touched Killarney yet 🙂 

Mono Cliffs, a day use park, is close to Tronto and offers the most interesting shorter hikes around.

I love Algonquin Park! Even if you are not camping there are still plenty of trails and beautiful sites to see! One of my favprite parks in Ontario!

There are some really great hikes at sleeping giant provincial park! There are many to choose from, so you can pick to suit your skill level. I highly recommend the hike to the top of the sleeping giant, the views are amazing!

Algonquin has great trails and bon echo 

The Cup and Saucer on Manitoulin Island is a great one and you can find many beautiful trails at Killarney Provincial Park. 
Make sure to do your our research on the trail you are about to attempt. There are many skill levels available for your enjoyment. 

Lake Superior Park has a very diverse network of trails with terrific vistas.

Lake Superior Park has a very diverse network of trails with terrific vistas.

Sleeping Giant PP has some amazing hiking trails. Located in Thunder Bay. The Top of the Giant hiking trail is moderate skilled and takes about 7 hours roundtrip. The views from the top are spectacular and is highly recommended