Horning's Hideout is a magical place, complete with ponds for fishing, disc golf, and peacocks. Like many places in the PNW, the terrain is hilly, and the trees are beautiful.
I stayed at the campsite nearest to where the ferry drops you off. There were several sites to choose from, and we were able to snag a spot with a small trail to Lake Michigan. There was a fire pit with a grill, and an out house style bathroom a short walk away. We hung our food to keep the chipmunks out of it- they did chew on my sunglasses case that I left out!
Hiking trails on the island are well marked, and fairly easy. I would recommend staying 2 nights if you want to see the whole island, though. With the ferry schedule, you wouldn't have time to see everything. I'd also recommend bringing more food than you think you need, in case the weather turns and the ferry can't pick you up on the day planned.
For being so remote, I wasn't expecting this campground to be so large! It was a nice location though, nestled between Muskallonge Lake, and Lake Superior. We drove about 20 miles down a washboard dirt road from this campground, to see the Pictured Rocks.
This camp ground is located right on Lake Michigan, and close to the bridge, and the dark sky park. We camped here for a night since camping is not allowed on Mackinac Island. It served our needs, but I felt that the campsites were really close together- I would have liked to have a bit more privacy from our neighbors. There are bathrooms and drinking water throughout, and each site had a power outlet to charge up.
I love that this camp ground is right on Lake Michigan, with a sandy beach. It's rustic enough, but close to Glen Arbor if you need anything. Also on the Heritage Trail, which is an added bonus.