The Attractiepark Slagharen ( Themepark & Resort Slagharen ) is a seasonal amusement park in Slagharen ( Netherlands ). It was opened in 1963 by Henk Bemboom (1921-2014) under the name Shetland Ponypark Slagharen and renamed Attractiepark Slagharen in 1998 . Since 2010 the official name of the park is: Themepark & Resort Slagharen . The park was owned by the Bemboom family and was run by Henric Bemboom. The park has more than a million visitors every year, making it one of the largest Dutch theme parks. The park was sold to the Spanish amusement park group Parques Reunidos in March 2012 . Since 2015, the resort has also had its own water park, Aqua Mexicana .