i've spent a fair amount of time park drinking, and i have a few tips if you're concerned about the cops bugging you.

it's not toronto, but in ottawa there's a large amount of wooded areas near the river that are on what i believe is ncc property that can accommodate a reasonably large group - 30-40 people. a frequent social event that came out of the local occupy encampment was bush fires in a series of clearings off the parkway. just make sure you take your garbage with you.

if larger groups clear out of the public parks proper in favour of more secluded spaces, it could open up more possibilities for smaller groups to enjoy the parks, which is more typical of normal life. while i agree that alcohol bylaws in parks are an infringement of personal liberty, there are a few ways to get around it.

i would suggest, for example, that if you bring alcohol to the park then you do so in unmarked or differently marked (even better.) containers. i tend to carry around a bottle of mountain dew with me, so i always have a flask of convenience. if some cops walk by and you're drinking a bottle of coke, they won't have anything to say to you.

but, i like this kind of thinking, and i'm curious to hear the nature of any official response to it.

https://www.cbc.ca/news/canada/toronto/public-drinking-ontario-fines-parks-1.5670177