Sunnyside is a lakefront district in Toronto, Ontario, Canada. It includes a beach and park area along Lake Ontario's Humber Bay, from west of Exhibition Place to the mouth of the Humber River. The area has several recreation uses, including rowing clubs, sports clubs, picnic areas, playgrounds, a nightclub, a bathing pavilion and public pool. The area is a 3 kilometres (1.9 mi) long strip along the lakeshore, bounded by the Gardiner Expressway and rail lines, which separate it from the Parkdale, Roncesvalles and Swansea neighbourhoods to the north. The name originates in a local farm owned by John Howard, which was situated just to the north, on the location of the current St. Joseph's Health Centre hospital.

The Frederick G. Gardiner Expressway, commonly known as the Gardiner Expressway or simply the Gardiner, is a partially at grade and elevated municipal expressway in Toronto, Ontario, Canada. Running close to the shore of Lake Ontario, it extends from the foot of the Don Valley Parkway (DVP) in the east, just past the mouth of the Don River, to the junction of Highway 427 and the Queen Elizabeth Way (QEW) in the west, for a total length of 18.0 kilometres (11.2 mi). East of Dufferin Street to just east of the Don River, the roadway is elevated for a length of 6.8 kilometres (4.2 mi), unofficially making it the longest bridge in Ontario, as it runs above Lake Shore Boulevard east of Spadina Avenue. The Gardiner Expressway is wholly owned and operated by the Province of Ontario.