From Hoek van Holland:
Take the A20/E25 through Rotterdam. Turn off onto the A16 towards Breda. Take the turn-off A15 towards Nijmegen. Before Nijmegen take the A50 sign posted 's-Hertogenbosch. Turn off onto the A73 (Nijmegen-Venlo-Köln). Then take the A77 towards Köln (Keulen), leaving at the Gennep/Nieuw Bergen/Heijen exit. At the traffic lights turn left. From this point 'Het Heijderbos' signs will direct you. At the next traffic lights turn left, then left again, before the petrol station. Stay on this road until after the viaduct. At the T-junction turn right. The second road on the left is the entrance to 'Het Heijderbos'.
From Schiphol:
Take the A2 through Utrecht direction 's-Hertogenbosch. Join the A15 direction Nijmegen, travel along the A50 until you come to the A73 (Nijmegen-Venlo-Köln). See 'From Hoek van Holland' for further directions.