There are a few that I've heard of, but the only ones I know personally are Snowberry Farms - they have a website. They are in Coleman, MI - kinda central MI, about 1 hr north of Saginaw Bay. Jim and Becky are their names - they are very nice people.
Up here in the Cheboygan area, Jakki Baltzer is good..she's opening a training facility soon, and we have had her out liked her and plan to use her.You can email or PM me and I will give you her phone number.
You can use me for a reference.
We will be boarding our horses there while we're in Florida next year, Maxine