Wow, aren’t the Loon and Drunen Dunes beautiful. I think the nicest thing is to wander through the sand. Tip: park your car behind the Klinkaert tennis courts, walk to the very end of the paved, and then the unpaved path.
You will come to a large expanse of sand and if you cross this you’ll get to a lovely 180° viewpoint (just 450 metres from Bosch en Duin). By the time you’ve walked back to the Steegerf, you’ve covered about 10 km.