More sights: Sacrower Church (beautiful church from 1844 which was inaccessible from 1961-1989, surrounded by the Berlin Wall), Pfaueninsel (Peacock Island with historic castle and royal boat house), Schwanenwerder (where Hitler and Goebbels bought villas in the 30s), the Wannsee Villa (where the infamous Wannsee Conference took place in early 1942). Your boat offers seating for 8 passengers, and your captain would be happy to let you steer for a while. You will be served cold beverages, and if the weather is nice enough, you may want to jump into the water for a swim. There is a shower on board. After your tour, your guide will take you back to your hotel via train (or via taxi, if you prefer - extra charge would apply).