Do you have to pay to get in?

It's $9 for a day pass or $33 for an annual pass for non-residents

Not if you have a Michigan recreation pass on your vehicle If you're not a Michigan resident you pay daily

Nope

Yes, a day pass is $11.00 . A better deal is to purchase the annual RV pass with your license plate renual.

No unless you don't have a state park pass.

A recreational passport is required to enter. You can purchase it with your license plate renewal if you are from in state. Otherwise you can buy a vehicle pass when you visit.