Potentially one of the most underrated national park campgrounds in the country. 5 lean-to / three sided shelters are available here; all were in great condition. Campsites are under the direction of the NPS, visit recreation.gov for required reservations and head to the NPS Acadia Isle au Haut page for full details on things to do and requirements for staying overnight.
We visited in May of 2018 once commercial boat service is available to the island but early enough only backpackers would be staying. When traveling to the campground via commercial service to the main portion of the island there is a 4 mile hike in. Closer to peak summer dates it appears boats are permitted to dock here. Plenty of day hiking on the southern island for 1-2 days and no hikes were more than moderate for the typically fit backpacker.
During our visit we found split firewood was readily available about 3 min walk away fro campground and one clean composting latrine was available.