Toronto is a bustling, cosmopolitan city with a wealth of things to see and do. A possible itinerary could include:
Day 1:
Visit the CN Tower for panoramic views of the city
Explore the Royal Ontario Museum, one of Canada's largest museums
Walk along Queen Street West, known for its independent boutiques, vintage shops and galleries
Have dinner in one of the city's many international restaurants
Day 2:
Explore the historic Distillery District, home to a mix of shops, restaurants, and galleries
Visit the Toronto Islands and take a ferry ride to Centre Island
Check out the Art Gallery of Ontario, which has a large collection of Canadian and international art
End the day with a show at the Second City, a well-known comedy club and theater
Day 3:
Visit the St. Lawrence Market, one of the largest indoor food markets in the world
Take a guided tour of the Hockey Hall of Fame
Visit the Casa Loma, a Gothic Revival style castle
End the day with a stroll along the Harbourfront and take in the views of the Toronto skyline.
This itinerary can be adjusted based on your interests and schedule, but should give you a good starting point for your trip to Toronto.