A relaxing way to enjoy Berlin and its attractions is to take a bus tour. A popular bus tour is the 'Top Tour Berlin'. This tours are conducted on double decker buses with an open upper deck. The day ticket entitles the holder to a full day of sightseeing. You can hop on or hop off at any of the 20 stops and continue with a later bus if you so desire. Each bus stop is served around 1 or 2 times an hour. There are live guides in German and English.