Even if you can't afford to stay in this super swank hotel, I recommend going to the Roof Lounge for a drink. It's located on the 18th floor and provides an absolutely stunning view of the city. The bar is filled with beautiful and rich suede and leather seating and wonderful dark ambient lighting.
There's also a summer terrace which provides an even more breathtaking view of the Toronto skyline. If you're visiting for the first time, it's a great way to see the city. Even if you've lived here all your life, this is a wonderful new way to soak up Toronto.
However, because its the Park Hyatt, the drinks aren't cheap, They do have an extensive list of exotic cocktails (I had something with lychee in it) which are tasty but pricey. We just snacked on some complimentary nuts and olives because even the snacks and light fare they served seemed pretty overpriced.
This is a must see for those visiting Toronto but probably not something you'll find in any guidebook!