The Skydome is home to the Toronto Blue Jays baseball team, who contest the World Series in the American League, and was the first retractable roof stadium in the world. It's next door to the CN Tower on the Harbourfront, so it's not too hard to find.
Canadians are rabid fans of Ice Hockey; and the city's most important team by far is the Toronto Maple Leafs who play in the American NHL. On match days, you'll find sports bars full to bursting as people tune in to watch the team playing.
Tickets are always made available on the day of the match and are available from the box office at the Air Canada Centre.
There are plenty of golf courses around the city, which allow non-members to turn up and play - provided they book in advance, and the best of these for all abilities is the Don Valley Course tight in the city on Yonge Street.
The Molson Indycar race takes place at Exhibition Place in Mid July, and is the city's premier motorsport event, and a must see for fans of American open wheel racing.
The International Toronto Marathon is fast gaining a reputation as one of the most important road races of the year, and it attracts runners of all abilities from all over the world, who come either to compete, or to raise money for charity.