N 45°58.735’ W 081°54.940’
If you’ve ever overnighted on Manitoulin Island, odds are you stayed on Goat Island. It's where the locals send you if you ask. That’s how I found the two spots I listed on Goat Island…They are functional but not very comfortable.
Here’s an alternative that’s questionably legal, so I wouldn’t recommend setting up shop. You can spend a pretty comfortable night there, though. Just before the Swing Bridge is a parking lot, with a Porta-Potty, adjacent to a field. You can easily drive your car up the trail and park in the shrubs and trees. Not only will this let you spread out on the grass comfortably, but there are picnic tables, trails and plenty of shoreline just a two-minute walk from there. There is even cover if it rains. I’ve met bicyclists using the trail area for overnighting as well, so I’d imagine if you are stealthy like I am, you should have no problems spending a night or two. I believe all of this is located behind the Manitoulin Hotel and Conference Center. It’s also about a half-hour drive to Bridal Veil Falls, a beautiful place to spend a day and worth the drive.
If you choose to use this spot, I hope, like me, it's nothing but a pleasant spot to stopover. Manitoulin doesn’t seem to have much in the way of Crown Land, but this should suffice…at least as a base to do your own exploring.