Iconic and world renowned Algonquin Park, despite being a Provincial Highway, is a fantastic place to cycle. The pavement is very good (re-surfaced in 2013) with wide paved shoulders.
There are great opportunities for wildlife viewing, excellent scenery, while the elevation change makes for challenging ride. Leave early to miss most of the traffic, and get some breath taking sunrise vistas over any number of the lakes that you will pass by while you ride.
If you are parking at the Visitors Centre, you will have to buy a day pass. However, if you park in Dwight and bike into the park (adds another 20km each way), then you won’t. There are some businesses along the way that you could probably park at as well.
Click here for a link to the Strava map and route information.