We’ve been going to duinrell every May half term break for the last 20? years. It’s very safe. We’ve booked tents, duingalows, euro camp.. tried about every option there is.
in summer it’s crowded. It’s like the Dutch version of Thorpe park so keep in mind during summer there will be a LOT of visitors.
The water park isn’t included if you don’t book accommodation directly with the park itself. This is now why we always book directly with Duinrell, cause Duingalows come with 5 WiFi passes as well as 3 or 4 visits to the water park (depending if you’re booking for 5 or 7 days). Since Covid they’ve implemented a booking system for the water park, which prevents it getting too crowded.
It’s very safe though, there’s loads for kids to do and you can let them go off and cycle to explore on their own inside the park. We always hire bikes while we’re there cause they come with convenient locks, so we will cycle into Wassenaar for shopping, the beach is a short cycle/drive. You can cycle to Leiden as well if you’re after a longer day trip. Mostly our days are structured around taking the kids to rides in the morning, going for an ice cream after lunch, more rides, then going for a swim in the evening, then dinner then bed. Our oldest (now 8) was about 3 or 4 the first time she really understood what was going on. She would finish swimming, get home, eat dinner, then sleep for 14 hours. Younger kids are absolutely knackered by the place.
One thing we have left to try is taking a caravan. The new duingalows are very nice though so I’m loathe to give up the convenience…