• Check the water first on zwemwater.nl or the Marineterrein site, which post the latest quality result and water temperature
• Swimming at your own risk inside the area closed off by the floating boardwalk, so keep younger kids within arm's reach
• Paddleboards for rent from the Sup Sup Club box on site, each set with a paddle, life vest and waterproof phone pouch

The inner harbor of the Marineterrein, a former navy yard, has been an official swimming spot since April 2025. A floating boardwalk closes off the water for laps or floating around on hot days. Water quality and temperature are posted online. Swimming is at your own risk, so it suits confident swimmers.

Nearby, a Sup Sup Club box rents paddleboards and a fitness garden has monkey bars.