Zeeland
WaterLand Neeltje Jans - Water, water, everywhere.
Deltaworks (Stormvloedkering Oosterschelde) - If your family likes engineering projects, dikes and locks, this is for you! At the Deltaworks, you can see the huge sea locks, doors that are shut to keep out the North Sea during storms. The Delta Expo has exhibits that show how the Dutch built these locks and dams to safeguard Zeeland from flooding. Impressive even if your kids aren't budding engineers.
The Water Pavilion is devoted to water in all forms - really makes the water cycle come alive. Don't miss the water play place, a series of pools, stepping stones, small scale water engineering where kids can play for hours. Take a boat trip to visit the dolphin station (April - Oct.).
Middleburg -
Miniatuur Walcheren - This is a miniature version of Walcheren Island - 350 models of towns and villages, a miniature fairground, bridges that go up and down, ships sailing around on the water. There are boats you can pilot from shore, and a pint-sized steam train goes around the park.
Lange Jan (Long John) Tower - In the center of town, climb to the top of Long John Tower, 87 meters high. From the top, you'll get a view of the North Sea, clouds and fields that feels like a Dutch landscape painting.