Lennox Addington County (Greater Napanee, Loyalist) — about 2 hours from Toronto and Ottawa and 3 hours from Montreal.
http://www.lennox-addington.on.ca/explore/county-trails [Lake Ontario and Hay Bay]
Northumberland County (Port Hope, Cobourg, Alnwick/Haldimand) –about 90 minutes east of the Toronto area
www.NorthumberlandTourism.com/CyclingLoops [Lake Ontario and Rice Lake]
Durham Cycle Tours—a pdf map showing 14 fantastic cycling loops that include the Great Lakes Waterfront Trail (off-road from Pickering to Oshawa!) and the Greenbelt Route. It describes over 700 km of cycling! Download GPS and PDF versions of the map at https://www.durhamtourism.ca/cycletours.
St. Lawrence River (100 km of great riverfront!) — The Great Lakes Waterfront Trail running alongside the 1000 Islands Parkway provides a traffic-free option for cyclists to enjoy the stunning water and island views that make the stretch between Brockville and Gananoque a popular touring route. This cycling adventure begins in the beautiful city of Brockville, on the St. Lawrence River, and heads west along the Waterfront Trail, connecting to the off-road cycling trail just past Butternut Bay. Plenty of beach, swim, picnic and lookout stops will easily see you through till sunset, with recommended stops at Brown’s Bay, Mallorytown Landing, Rockport and picturesque Ivy Lea. Our thanks to the RTO9 for developing the itinerary. Includes MapMyRide mapping https://www.mapmyride.com/routes/view/64644620. Download pdf maps 6-7 to 6-10: https://waterfronttrail.org/maps/wt-zone6.pdf