Time Out says
Also known as the mini Grand Canyon of Hong Kong, Pineapple Hill has become an Instagram hotspot in recent years – and there are no surprises why. Located to the northwest of Tuen Mun, the 'canyon' has been shaped by nature over many years, creating lots of interesting ridges and dips. For the perfect 'grammable moment, take a picture at sunset. Do be careful though, as the ground can be rather bumpy and irregular.