Brockville is a town of 21,000 located on the St. Lawrence River and is considered the eastern gateway to the Thousand Islands area in Ontario. One can put together a nice run combining paths along the waterfront and some small parks, most of it connected by the paved multi-use path called the Brock Trail. Includes the unique railroad tunnel trail!
Start right downtown in Centeen Park. The first 2.5 km of the Brock Trail follows the path along the water and around the marina into Hardy Park (brief connection using Flint St.). Then continue Brock Trail inland for 3.5 km. It follows the outline of a creek, with the final 1 km through a series of three small parks. At the end, double back briefly to Central Ave. Turn LEFT, and then RIGHT on Park Ave., heading back south for ~1 km. At Victoria Park, RIGHT on Pearl Ave. to the entrance of the Railway Tunnel trail — an 0.5 underground trail in Canada’s first railway tunnel — which also has a fun sound and light show (note: can be slippery). Exit the south end and use Water St. to conclude the run.