Het Twiske is a large recreation park, just North of Amsterdam, in between the villages Oostzaan, Landsmeer and Den Ilp.
It contains walking and cycling paths, and a large lake in the middle with several beaches around.
The water quality is monitored, so it is safe to swim here (unless signs say otherwise).
The park does not close, and is freely accessible year round.
Cyclepath in 't Twiske
Recreation area 't Twiske