My wife Diane took a bus trip with her friend Connie to the Insel Mainau on the Bodensee, but as Americans we call it Mainau Island on Lake Constance in Germany. Mainau is known as the Island of Flowers and is covered in parks and gardens. The Palm House and Butterfly House are fabulous along with the Castle of the Teutonic Order.
According to wikivoyage.org, its German name, Bodensee, derives from the town of Bodman, whereas the international name is derived from the city of Konstanz and was adopted mainly by the Roman-Catholic world after the Council of Constance.