High Quality Content by WIKIPEDIA articles! Sunnyside is a lakefront district in Toronto, Ontario, Canada. It includes a beach and park area along Lake Ontario`s Humber Bay, to the west of the Exhibition grounds, at the foot of Roncesvalles Avenue where it meets King Street West and Queen Street West. In the 1910s, the area was the site of a massive waterfront reclamation public works project. From 1922 to 1955, the reclaimed land was home to the popular Sunnyside Amusement Park which was demolished in 1955 to facilitate the building of the Metro Toronto Gardiner Expressway project. Transportation land uses dominate the area today.