My wish list for the islands would start with nature.
Though I am all in favour of preserving the homes, beaches, and some picnic spaces to be sure, there is a lot of 'blank' land mowed for no obvious reason, which is doubtless difficult to maintain to a high standard in a manicured form, and for which the City has neither the money nor vision to do much.
So I'd like to see expanded 'naturalized' areas with native plants, particularly along non-beach shorelines, especially the interior channels and the lake-facing side. I too want to preserve some good skyline viewing on the city side so there is less (but not zero) room for natural shorelines on that side.
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Part of my desire for the natural areas is not just the desire for greater sustainability or nature viewing or the like, its also to facilitate a redirection of maintenance resources so that the 'grand' pathways coming out of ferry terminals and leading to key destinations, where manicured maintenance is more appropriate can get more elaborate flower displays, public art, and fully reflect the specialness of the islands.
I think the opportunity exists for greater recreation through cycling, canoe-ing kayaking and hiking.
Respectively, by bringing Bixi to the islands, better advertising concerning ease of canoe/kayak rentals, and creating new smaller 'hiking' trails as larger naturalized areas form.
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Abandoned civic facilities should be removed, and washrooms should be better designed to withstand low-maintenance levels. (sensor tabs, trough sinks, auto-flushing, vandalism resistance) etc.
While I don't want widespread commercialism, the thought of adding one more restaurant, something high end, to the islands, with a great view of the city, that might help provide 'eyes on the street' so to speak and could be a year-round attraction has some appeal to me.