There is no public transportation out at the end of MacLehose Trail Section 2. Here, I introduces 3 routs for hikding MacLehose trail section 2.
Route A hike Section 1 and 2 together.
Follow Section 1 and Section 2 together but continue after reaching Sai Wan Ting to Pak Tam Au (北谭凹).
Note, Section 1 and 2 together are long.
Route B walk back after you reaching the end of Section 2.
Go to Sai Kung Bus Terminal.
Take 94 Bus to Pak Tam Au(北谭凹) at Sai Kung Bus Terminal
Start from the tail of MacLehose Trail 2 at Pak Tam Au, hike conversely along the Section 2.
Reach Tai Long Au(大浪凹) (Pass Chek Keng(赤径)), have a rest and then return by the way you come.
Reach Pak Tam Au again, then take Bus 94 back to Sai Kung or 96R (only on Sundays and holidays) to Choi Hung or Diamond Hill MTR station.
Route C Hike from Sai Wan Pavilion to Pak Tam Au
Reach Sai Kung.
Then take a taxi or Minibus 29R to the Sai Wan Pavilion.
(NR29 minibus timetable: http://www.td.gov.hk/filemanager/en/content_405/nr29.pdf / http://www.td.gov.hk/filemanager/tc/content_405/nr29_chi.pdf )
Reach Pak Tam Au and then take Bus 94 back to Sai Kung or 96R (only on Sundays and holidays) to Choi Hung or Diamond Hill MTR station.
Maps for MacLehose trails: http://en.dimjoeng.com/qa/182/maps-of-maclehose-trails
Reference of route C: http://www.discoverhongkong.com/eng/see-do/great-outdoors/hikes/macLehose-trail-pak-tam-au.jsp