On 11 September we took Martijn to Six Flags Holland. It's a big roller coaster Park located about 60 km north of Hilversum. They have been taken over and the park is now called Walibi World. Have a look at their website or look at the pdf document of the park.
Inge and I had a year pass (as we had in 2002 as well) so we could go as often as we wanted. Raimond and Evelien weren't very thrilled when we told them we wanted to take Martijn there, but after we told them that there also is a big part set aside for kids they let us take Martijn to see it. And he loved it to bits (although the waterslide did scare him a bit). Have a look at the video of that day in medium or high quality