Where to visit between Calais and Duinrell (Holland)?

[ZipityFlippity]

We are going to Duinrell in the summer and plan to drive from Calais staying somewhere on the way to make the holiday a bit longer. Can anyone recommend somewhere interesting and relaxing?

How old are your kids?

SwedishEdith
They are between 8 and 15

De Haan in Belgium is (was) a nice resort. And easy to get to Bruges for a day. There's a place called Da Panne on the coast which is a seaside town that has a little mini theme park and indoor pool thing if it rains. Nice big beach there. But I think the park is for younger kids.

Antwerp is a good half way point and there’s lots to do. We’ve stopped there multiple times. We like the city because there are lots of big beautiful parks, street art and plenty to keep the kids entertained.
If you want something relaxing, I’d recommend Middelheim Sculpture Museum. It’s a good place to stretch the legs and it’s fascinating.
Antwerp also has the largest chocolate museum in the world. It’s incredible.
If you want a full day out, then go to Antwerp Zoo - it’s one of the best I’ve been to. Besides spacious open cages, the zoo features many cozy areas for rest, charming cafes and decent playgrounds. The zoo has even a planetarium, a greenhouse and a special house for penguins.
If you are in search of a good place for walking, go to Antwerp Miniature Park – an amazing park full of precise miniature copies of the most famous landmarks of the city.
A boat trip in the harbour is also relaxing and there are a few options to choose from. We liked the Jan Plezier pancake boat. www.janplezier.be/en/pancake-boat/
The art park known under the name Verbeke Foundation is another fantastic place for family rest. The park is in the Antwerp suburbs, in the village of Kemzeke. This is a marvelous and an unbelievably beautiful place. It is easy to spend a whole day in the park.
We usually like to finish our evenings in Antwerp with a relaxing horse and carriage ride.
There are a few good hotel options
ramadaplaza-antwerp.com/rooms/family-rooms
www.antwerpinnhotel.be/en/rooms/family-room
www3.hilton.com/en/hotels/antwerp/hilton-antwerp-old-town-ANRHITW/accommodations/family-rooms-and-offers.html

Thank you both for the suggestions, I will have a look into them.