There are so many things to do in Toronto it's impossible to find a complete list. A good place to start is the City of Toronto's links list. Below also are some top requests:

Nature
• Edwards Gardens
• Discovery Walks
• Garden Tours

Active
• Golf: City courses. Other courses: Cedar Brae, Don Valley, Lionhead, Glen Abbey

Spectator Sports
• Air Canada Centre: Maple Leafs hockey, Raptors basketball
• Rogers Centre (skydome): Blue Jays baseball, Argonauts football
• Rexall Centre: Canadian Open tennis tournament
• Ricoh Coliseum: Toronto Marlins Junior A hockey
• Grand Prix of Toronto car race
• Glen Abbey golf gourse: Canadian Open golf tournament