"Daddy, daddy look at that!" Jonah (5) sounds fairly excited with his bright and clear voice in the warm morning air. My son lies on the small wooden footbridge on the banks of lake Winkelbergsee near Längenfeld - staring upside down into the water as if electrified. He discovered the trout frolicking in the emerald green, shallow lake. While I reach my son on the footbridge, my daughter Alma (7) is already getting rid of her shoes and stockings. Intrepidly she wades from the shore into the crystal clear, cold water and shouts: “Huh, that's cold! But refreshing!"