Where can I go / call to rent one of the shelters?

There should be a "park reservation" form at this link: https://www.portclinton.com/files/ The phone number is 419-734-5522.

Their number is 419-734-5522 to set up a reservation

Sanilac County Lexington Park 3885 Lakeshore Rd, Lexington, MI 48450 (810) 359-7473 https://g.co/kgs/yEHhW3