• Check the water before swimming: blue-green algae can appear in hot spells, and the province tests the official swim spots from May 1 to Oct 1, with warnings on signs and the Zwemwater app
• Paid parking, card only: €4 for the first 3 hours, €7 for longer, and the machines take no cash
• Easy by bike: about 10 minutes from Amsterdam-Noord and 45 from the center, with marked bike routes inside the area

Het Twiske is a 650-hectare lake and nature area just north of Amsterdam-Noord, and about a third of it is water. There are sandy swimming beaches, an adventure and water playground, a diving platform, a marina, day camping fields and the Twiskemolen polder windmill.

A 15 km loop of smooth asphalt circles the area, so kids can bike, scoot or skate it while parents walk.