Holiday Park is a very small theme park that offers one of the best rides in the world, Expedition GeForce.  With this ride, and a well-run theme park environment, Holiday Park is a must-visit.  Itss relative proximity to Heide Park, Phantasialand and Europa Park makes this an ideal stop-off point on the way to the Europa Park resort from Frankfurt-Hahn airport, which is served by many low-cost airlines from the UK.  Rent a car, and the german theme parks can be done in one straight line with an hour's gap between each.

Official Site: link