Do we need to do some kind of booking/appointment to visit or is it open for all during the hours?

Only thing you need is the state park sticker or $ if you dont have the passport.

Michigan State Park pass which you can buy for $9 per car before entering the parking lot. No appointment is required. Pass is good for other parks as well for a day.

Michigan State Park pass and we went in, dogs allowed on a leash.

We parked and walked right up. Ferry boat was help yourself as well.

Only thing you need is a Michigan Park pass.

Open to the public.