Oh wow, thank you for this. This is very helpful!It was empty on January 2nd for fireworks. I don't think it's ever busy.
Here is the firework views from the spot.
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The daytime views aren't that exciting, but in terms of the nighttime firework views, they are awesome, and its empty.
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The beach in question is just to the right of the bridge going to the cabanas.
The one thing, is at night, TTC has flourescent white lights, and while the ferry boats look cool, especially lit up, they honk their horn occasionally.