Bernil,
It is probably the most fun to go for the traditional games, the oldfashioned ones. The are very wellknown in Holland. the funniest is "koekhappen" ("biting the cookie �)
this picture is taken at my daughter �s birthday, I didn �t have the traditional �peperkoek � (a kind of cake) since I do no longer live in Holland but it was fun anyway. Another famous one is �zaklopen �(walking in a sack), which is usually done in the form of a competition, with a start and finish line:
Easy to make and fun to do is "blikken gooien" (toppling the cans). the cans are stacked and you try to topple as many as you can in three throws, the balls are usually stuffed socks shaped into a ball.
Believe it or not, these games are played by children and adults alike. You can find more if you google: Oud Hollandse Spelen � (most of these games were invented especially to provide a sense of national identity when Holland first got independence.. :)