Just got back from an 11 holiday at Landal Greenparks de Lommerbergen and we also visited a Landal park last summer (Landgoed t Loo). Both holidays were excellent and great value for money during the school holidays (if you book direct). Landal Greenparks are smaller versions of Center Parcs with a range of indoor and outdoor activities. They are car free parks (apart from arrival/departure days) so great when you have small children. The accomodation is clean, spacious and peaceful. There are a range of restaurants although food quality isn't brilliant. One slight downside is that most visitors are German or Dutch and they don't really expect English speakers. Having said that, all the staff do speak english. Finally, on both our trips to Holland we have been very impressed with the excursion and day trip options and nowhere is very far away. We'd particularly recommend The Kroller-Muller museum, Burgers Zoo and the Dolphinarium.
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