The beaches in the Netherlands run up the entire coastline pretty much. Similar to Belgium and Northern France, they are wide swept beaches with sand dunes and parkland. The tides are pretty big so sometimes the water is a long walk out. Still the wide beaches are nice and offer a lot of room to play on.
The dunes near our beach area in the Hague are large parkland with bike paths, walking paths and horse trails. We have foxes, rabbits and even 2 shaggy cows and their calves wandering around. That gives you quite a turn when you see these on the loose actually and we were kind of nervous to walk past them running freely (they have enormous horns).