The two trips mentioned here can easily be combined on a longish day trip.
20km northwest; half day
This medieval-looking moated castle houses a private modern art collection with a focus on Joseph Beuys and is anchored by a lovely park filled with wacky sculptures.
17km northwest; half day
Kalkar boasts a pretty medieval core centred on a proud Rathaus and the stunning 13th-century St Nikolaikirche, famous for its nine wood-carved altars.