When we got Bergen aan Zee in the North Holland Dune Reserve we could see golden sand between the gap between the dunes. We could also see Kite surfers at Bergen aan Zee. That should have been a hint. Once through that gap, sand slammed into us at high speed. The teens declared that there would truly be sand in the sandwiches, if we sat there and ate our picnic. We managed to find a spot in the lee of a beach hut and watched the kite surfers taking advantage of the wind whilst we munched on sand free sandwiches.