Not sure what you are looking for. If you just want to spend a week on the beach, just about any beach will do depending on whether you wanted to see the sun rise or sunset. For us, we pick camping spots by what else is in the area. For instance, we go canoeing/kayaking, hiking, biking, museums, searching for Petoskey stones, light house tours, bear ranches, water fall tours, old historical sights, grist mills, ghost towns, forts, ice cream shops, etc., etc., etc. So I guess if we knew a little more about what you wanted to do and see, it would be easier to suggest something. I can tell you this in general, most of my personal best spots in Michigan are in the UP. but that is a big area and still you need to know what you want, before I can suggest what you might like.
Just one more piece of information I'd like to share with you. You are no supposed to post the same topic on more than one forum.