You can eat delicious homemade ice cream in a beautiful place with a cozy terrace on the Sluis Leidschendam. They also have coffee and tea with cakes, ice cream cakes and delicious iced coffee (Frappuchilly's). They have gluten-free cones and are lactose-free. You can also sit inside. But outside in good weather is of course the most fun, with the boats sailing in and out of the old lock. The service is very nice and smooth.