A section of this park was used to film Gandalf riding into Isengard. Nearby, another scene was filmed in which Saruman and Gandalf are walking in the Gardens of Isengard.
Click the image to toggle between the original and a colour-graded version that matches the actual film scene.
GPS coordinates: -41.1014, 175.0935
The link opens in Google Maps (desktop) or in the Google Maps App (Android).