Wilson trail 1 is only 5km long but probably the toughest hike on Hong Kong island involving some 2000 steps to climb, crossing both the Twins and the Violet hill. I did it starting from the end at Park View and going towards Stanley, and all I can say is to strongly recommend against this hike unless you’ve climbed a lot of steps before and if the weather is hot and sunny. This trail is where I learned that you must learn to manage your speed in steps 😉
Regardless, it is simply beautiful trail and highly recommended. If you are atleast medium level hiker in terms of fitness.