The pop-up camper rental is $58 a night, not including $10 reservation fee. If you meant you are bringing your own camper, then it is $23 a night, plus reservation fee. You must also have a Recreation Passport when you arrive (www.michigan.gov/recreationpassport). The pop-up is only available for the summer season though the campground itself is open all year round. Contact 800-447-2757 or www.michigan.gov/baycity to make a reservation.
I can't add anything else to that !
They are open year round, and I believe it is a flat site fee. But you can check on their website for exact information.
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