Hi, I'm from Switzerland but we're willing to travel too! :-)
We'be been to La Zorn yesterday:
Nice parc, big, different kinds of obstacles and challenges. Nice camping area. EUR 18.- the whole day.
Also we went to see "Offroad Park Langenaltheim". Also very nice, 20.- the day, we rented the briefing container and there are nice guesthouses around (EUR 45.- per 4-person flat incl. breakfast is cheap for Swiss dimensions) :-)