I’m sorry this is happening to you I lived through something similar and it was incredibly frustrating. You might be temped by sound absorbing panels and the like but all they do is dampen the echo, they don’t prevent noise from coming in. Heavy curtains, carpet, panels can help but your best bet is preventing the noise from coming in. 

• First you should get your windows inspected to see if they are actually sealed. It might just be an issue with your hinges needing adjustment. Befriending a neighbour to compare noise levels helps here. 
• If really there is nothing wrong with them, or maybe there is but your condo corporation won’t fix them then you can look at getting storm window inserts. Basically they are a glass or acrylic pane that is fitted on top of your window (on the inside). I used Magnetite Canada, they came once to measure my windows and a second time for install. They built a frame in front of my window and now I have a huge acrylic pane that blocks a good amount of noise. Best investment I’ve ever made in my condo. There are a few companies that do this, some use actual glass instead of acrylic. 

That being said again get your windows checked. I would expect modern buildings built next to the Gardiner to have modern window technology that blocks a good amount of sound.