I live in Toronto and really like the city -- it's a big change from home in New Brunswick, but I've grown to be very fond of "t-dot" in the last couple of years. Once you get over the centre-of-the-world mentality and the Leafs-nation crap (which is easy, since the team is struggling and fans are booing), you'll find that Toronto is one of the most diverse and comprehensive cities in the world.
I guess what you do depends on where you're staying -- Whitby isn't exactly close to downtown, but you can the train to Union Station and be in the heart of the city within an hour. If you are staying downtown, that opens up a lot more possibilities...
Incognito has some great suggestions... I guess it really depends on what you are in to. Phantom of the Opera is currently playing and there are still some tickets available in March for weeknight and matinee shows. Obviously a Leafs game is an option -- you can probably find tickets for $80 to $100 for weeknight, non-rival games. Raptors tickets are much eaiser to come by...
As you said, the HHOF and the Falls are must-see attractions. If you're in to casinos, plan to spend a night in Niagara and you'll have a blast. Obviously there are lots of choices for restaurants and bars... depending on your style. Toronto.com is a decent resource...
Let me know if you need any specific help or have any questions...
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