If you can handle heights visit the cn tower. It's a very cool experience, I learned a lot reading and seeing historic pictures they have up. The sky walk and restaurant is next for me when I go back cause when I reached the top and stood on top of the glass floor I didn't stay long. And my gosh they are too pricey there :P call before you go to find out the different prices to go higher and higher. The restaurant and sky walk are also separate prices and when you leave you got to pay for your pictures also souvenir shops are available $$