Mainau (D) island.
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Treat yourself to an unforgettable stress-free day on Lake Constance. Take a boat or the island bus from the town of Konstanz to the flower island of Mainau on Lake Constance. On the island, with its Mediterranean feel, you’ll find a park with a 150-year-old arboretum, fairy-tale baroque castle buildings and churches. And Mainau has plenty on offer to keep the youngest visitors happy too.