Hi
We have been to this site a few times, it is great for kids. Its a short walk to the rides and most are free. Driving in Holland is very easy, just like france.
As for places to visit there are a few nice beaches within 10 miles and one you can ride your bike to if you take them with you. Amsterdam is about 1 hour away, a very good dolphinarium is about 1 1/4 hours away. Dont forget to go to the pancake house's, the one just outside the site is very good.
The local village is nice and is only about a 5 min walk from the site.
If you prefer peace and quiet ask for a pitch the other end of the site from the ammusments because the kids can get a bit noisy in the evenings, they also take grouop bookings from english football teams so you dont want to be too close to them.
Simon