I lived on an island for eight years. Because of exorbitant ferry fares, we learned to limit our trips off-island to once every three weeks. We grew a lot of our own fruit and veggies, supplemented by organic produce bought from on-island growers.
We learned to keep a good supply of food on hand, and were well equipped to suvive week-long power failures. We weren't off-grid, but we had neighbours who were. The same neighbours lived in a 140 square foot house that they built themselves, before "tiny houses" were trendy. They were building a "big" house when we left: 400 square feet.
There was a surprising amount of stuff to do for an isolated community of 1100 people. It had the highest percentage of PHD holders of any community in Canada, believe it or not. Lots of interesting people. The local electrician had a PHD in marine biology, and there was a potter with a PHD in social sciences.
The best years of my life (so far) were there. The 1960s were alive and well there.