A big park in the south of Bonn directly behind the Post Tower. You can walk there from the city centre following the rhine promenade, it is about 3 km and very popular on the weekend.
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Deutsche Welle (DW) is Germany's international media outlet and is now housed in what was supposed to be the German parliament's home. After the German government decided to move the building was taken over by DW to become its headquarters and home to its radio operations. Tours are conducted in German, however, tours can be arranged in English, French, Spanish, or Portuguese when requested in advance. DW asks that anyone wishing to take a tour reserve at least two months in advance and may require you to be with a group of 6-20 persons, however, they may arrange an exception if contacted. Tours last an average of two hours.
The Deutsches Museum Bonn is an offshoot of the famous Deutsches Museum in Munich (its only branch outside the Munich area) and features about 100 contemporary exhibits of science and technology.
It hosts changing exhibitions which range from visual art and cultural history up to science and technology. Most of them are world class and definitely worth a visit.
Modern art museum with a large and interesting collection as well as a good cafe.
House of the History of the Federal Republic of Germany
An interesting explanation of German history after 1945 that is constantly updated. A must if you are interested in history or politics. Exhibitions are presented in German only, but audio guides are available in English, guide booklets with English translations are available for a couple euros, and guided tours for school groups conducted in English are available free of charge when prebooked.
Until 2001 it was used to house the office of West Germany's chancellor and the chancellor's cabinet. Today, the building is used as a secondary headquarters for the chancellor.