I used to love going to Belle Isle!
A bit further north, by Caseville, there is a peninsula called Sand Point, that juts out about 7 miles into the Saginaw Bay.
Story is, that it was all swampland, infested with snakes, and worthless.
Until some guy bought the whole thing for $3800, fenced off the base, and released pigs to kill the snakes.
He then charged hunters to kill the pigs, drained the land, and developed it.
VERY high end, expensive property!