The following sights are slightly further afield but can easily be visited in a day:

 
1. Allensbach Wildlife and Leisure Park www.wildundfreizeitpark.de/

2. Affenberg Salem www.affenberg-salem.de

3. Conny-Land www.connyland.ch

4. Zeppelin Museum, Friedrichshafen www.zeppelin-museum.de
5. Arenenberg Castle www.napoleonmuseum.tg.ch