About 50 km west of Kassel is...
About 50 km west of Kassel is Bad Arolsen situated. It is a small & quiet town. It is situated in a very beautiful environment with a lot of walking & cycling possibilities.
Besides that, there is also the Schloss (Castle) which can be visited.
Take a look at the travelogues to see more.
Some more info can be found on BAD AROLSEN
Firedrichsplatz (Frederick's Square) is the heart of Kassel. It's located just next to the main shopping street and a good place for relaxing or having a coffee in one of the many cafes. At the moment with documenta going on, Friedrichsplatz has been turned into a poppy field which looks magnificent. Unfortunately, this is only the case for 100 days - but who knows if Kassel's inhabitants don't get used to the field and want to keep it? We shall see next year!