Travelling from Michigan

Hi guys,

Couple from Italy 🇮🇹, we are arriving in the US on September, based in Detroit and then starting from there our trip.
7 nights at all.

We have the car, and the would like to visit the best natural places, and spend 1 day in any city.

We would do 2 night there/ 2 nights there and 1 night / 1 night to come back.

- places already visited : Michigan / Wisconsin / West Virginia/ Ohio.

What do you suggest do visit?

Thank you!