This is a very easy find, great for kids.
Portsmouth Olympic Harbour was built in 1976 for the sailing
events of the Montreal Olympics. There is plenty to see here.
Nearby are boats of every description, including the Brigantine St
Lawrence II (tall ship), Coast Guard Cutter Cape Hearn, and
hundreds of sailboats.
The nearby building has big clean public bathrooms. There is a
playground and green space nearby. Portsmouth is connected by
waterfront trails to Lake Ontario Park (there is a shortcut south
of the Coast Guard station).
Congratulations to swimmrguy on the FTF!