First, go to Sai Kung.
Then, take KMB bus 94 and get off at Pak Tam Au (北潭凹) bus station where the Maclehose Trail Section 3 starts.
There were 3 hills along this section: Ngau Yee Shek Shan (牛耳石山), Wa Mei Shan (畫眉山) and Kai Kun Shan (雞公山).
Reach the end of Section 3 at Kei Ling Ha (企嶺下) where there is a rest area.
Walk around 5 minutes along the road in either direction and you will find bus station where you can take 299 or 99 to Sai Kung.