Of course there's much to enjoy if you stay on or near the campsite.
Directly from the camping you can follow a few biketracks; a good example is the tour 'around the Olstappenlake'(16 or 22km). You can spot the campground from the other side... Of course there are more options, sometimes more challenging. Ask for advise at the reception.
The camping itself has a few opportunities too;such as badminton, volleyball, darts or relaxation on or by the sea. There is a children's playground and a trampoline.
In the common room you can watch TV or play Playstation or soccer.