What is the purpose of the islands in Township?

The islands add a fun exploration element to the game. You can trade goods and unlock new items that aren't available on the mainland.

I love the islands for their aesthetic and the variety they bring to the game. They also provide a nice change of pace from the usual farming and city building.

Pro tip: Plan your island visits around your production needs. That way, you can always ensure you have the right ingredients when you need them.