On 400 private acres at the eastern tip of Kangaroo Island, near Cape Willoughby, five CABN X cabins look out to open ocean. Off-grid and run on solar and collected rainwater, each has a private outdoor bath and sauna, an indoor fireplace and a pizza oven, a king bed and a full bathroom, with exclusive beach access and walking trails at the door, and no wi-fi. Four are ocean-view; one is an all-abilities coastline cabin. It is a two-and-a-half-hour trip from Adelaide, island included.