This unusual nature park is covered with sand formed into tall dunes. The pathways along them make for a nice walk.
Wikipedia http://nl.wikipedia.org/wiki/Westduinpark
More information on The Hague's official website http://www.denhaag.nl/home/bewoners/to/Westduinpark-en-Wapendal.htm
Address Den Haag 2583, Netherlands
Coordinates 52°4'59.704" N 4°14'59.885" E