For a bit of variation from sun and sea: Street Jump, the largest trampoline park in Haarlem. It offers an active day for the whole family!
Jump from the one to the other trampoline in one of the 10 areas of the park, or clear large obstacles.
The bounce areas are suitable for all ages and every level of skill. There are many different activities available.
For more information, check the website: StreetJump