^ Well, whatever else happens to Northerly, we can pretty much count on an Olympics venue there should Chicago get the games.
At some point, someone (in city planning?) suggested camp sites, but I can see all kinds of problems with that - crime, used syringes, Chicago jellyfish, etc.
I was thinking perhaps an airport for the island, but I think that has been tried already
But it is an island, so it would be nice if whatever goes in capitalizes on the island aspect.
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As for Grant Park, it is a more formal space than, say, Washington, Jackson & Humboldt parks. I think of it as a kind of village square or green, blown up to a properly gargantuan Chicago scale. Personally, I like the idea of festivals, rallies and concerts there, in keeping with the village green aspect. Perhaps the notion of GP as a series of distinct outdoor rooms could be explored/enhanced more thoroughly.
GP is the only urban park I can think of offhand that gives up its best side from the vantage point of a skyscraper/tower. You experience & understand it in a very different way from up there. It is somewhat like the great classical French gardens, which offer up one elevated viewpoint from which you can survey and make sense of their grand schemes.
Too bad about all the vehicular traffic, though.