D'n Diek (The Dyke) is in fact a dyke along which most shops are situated. There's ample choice of shops. Good quality fashion shops although you must realise that due to the strict protestant faith here, you will find the latest fashion alongside conservative clothing.
Middelharnis is, as the rest of the islands, a stronghold of protestant orthodoxy. This means that on Sundays, everything is closed. You will see girls in long skirts walking around etc.