Don't go inside the CN Tower, it's a waste of money (at least to me, it is). Just get a picture taken on the outside. Blue Jays suck, but you can get cheap tickets and it's worth it just to see inside the Skydome. If you want a museum, go to the Royal Ontario. It's amazing. Medieval Times is also fun, but expensive. Erm..
As for bars, there's a grill nearby the old Mike Bullard CTV building. I forget the name, but the food is good. Or if you like comics or any sort of quirky stuff, Silver Snail is the place to go.
Just explore the city. It's alot more fun if you head out and don't know where the hell you're going.