The sender is from Zossen , just south of Berlin , but was vacationing on Rügen , the largest island in northeastern Germany . Rügen is a popular tourist destination, known for its distinctive resort architecture, diverse landscapes, and long sandy beaches. It attracts many outdoor enthusiasts, particularly windsurfers, kite surfers , and surfers. Cycling is also very popular, with a circular path that runs around the entire island. Even local buses are equipped with bicycle carriers, making it easy to explore the island on two wheels.