That looks like an experience I would like to try... I spent a few days on an Eco island in the Philippines this past week where everything was solar, no AC, no internet except in the main dining area. It was nice, had to find things to keep busy.. I wouldn’t mind doing it for a longer retreat and using the time to read, exercise, maybe learn to meditate but would have to find a time to take a long vacation, It was the end of the season, so they stopped the daily yoga classes and we didn’t manage to make any of the meditation sessions