For the first time, the Swan Valley's Whiteman Park has welcomed more than one million visitors in a single year - more people than go to the Perth Zoo and ferry to Rottnest Island combined.
According to the manager of the 4000ha nature reserve, Steve Lowe, the park's popularity has grown steadily since entry fees were abolished in 2001, when about 180,000 people visited every year.
"While other tourism destinations are struggling and moving backwards, we continue to move forward," he said.
Guildford resident Fleur Bugarin was officially recognised as the park's one millionth visitor.
The 33-year-old, who had just returned from a nine-month stint working in Antarctica, was celebrating her homecoming with family and friends.
Ms Bugarin said she was honoured to share such a significant milestone with a place she spent many childhood days, picnicking with her family and chasing around her four brothers.
"Growing up in Guildford, we spent quite a bit of time here and I have very fond memories of this place," she said.