Minneapolis in May (what to do?)

Hi all,

Anyone have any suggestions for what to do around Minneapolis in late
May for an outdoor-oriented husband and wife? It can but does not need
to involve fishing. We looked and didn't see anything close by. One
thing we considered was a weekend on Isle Royale, but I was hoping you
locals might have other suggestions, too. Is late May mosquito season?

Also note that we have disability restrictions that preclude hiking,
but virtually everything else is fair game.

Thanks,

Jon.