Ok, so I didn't go to Amersfoort, but that doesn't mean I don't know how to have fun!
If you like puzzles, time constraints and cars... this is NIRVANA:

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8/06/05 - Hitchhiker's Guide
TRC presents a gimmick rallye starting in Mountain View. Registration will be open from 5:00 to 7:00 PM at Larry's AutoWorks, 2526 Leghorn Street near the Mountain View Costco off of 101. For more information, see the flyer or write to rallyemasters Bob Schott and Ken Schott.

Flyer here:
http://www.therallyeclub.org/H2G2_Flyer_1.pdf

More info about gimmick rallyes and the organization here:
http://www.therallyeclub.org/index.html

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A car rallye has been described as an extremely large board game: public streets are the board, and your car is your playing piece. In each car, the driver and navigator(s) carefully follow instructions that direct them along a given course. There is a friendly competition at the finish to see which teams followed the course most accurately.

The Rallye Club (TRC) produces gimmick rallyes and timed rallyes. These rallyes come in various shapes and sizes, but they are all non-racing events held on open public roads. Rallye teams include friends, couples, and entire families, and any type of vehicle can be used.

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So down that pan-galactic gargle blaster and prepare yourself for excitement, adventure, and really wild things on August 6.