Toronto Island is a must see and it is basically free, an oasis in the middle of the city. The island is a like a large peaceful park with beaches (there's a nude beach, gay beach as well as regular beaches), rollerblading, biking and walking paths, and even an amusement park and free petting zoo for children.
Ferries leave every 15 minutes from Bay St and Queens Quay at Harbourfront, just south of Union Station. There's plenty of parking too. www.toronto.ca/parks/island/index.htm
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