This was one of my favorite biking trails that I've encountered in my travels. It is long (over 450km/280 miles), and actually comprised of three interconnected sections, mostly along Lake Ontario: Etobicoke (west), Toronto (central) and Scarborough (east). I only had the pleasure to ride along the Toronto Portion.
Within those 280 miles, you have 182 parks and natural areas including numerous beaches, 31 communities, and over 170 marinas and yacht clubs. Part of this trail also includes the Thousand Islands, providing access to the archipelago, and its beautiful scenery. The trail is one of the best ways to venture outside and see the Ontario coast line. But as of recently, it is now unlawful to do so via motorized bikes/scooters- so don't be afraid to get out an e(h)xercise. read more