>>1406119Sunset Peak is definitely one of the best. The abandoned huts along the way really add to the scene, making it a bit more interesting than Lantau Peak / Phoenix mountain (which is great too). btw, even though the big buddha monastery area there is really played out, it's kind of awesome to descend from the top of the mountain towards the monastery area in the fog and be greeted with those big wooden sutra columns emerging from the mist.
Lantau island is pretty great in general. In particular, I really like the trail from Shek Pik dam west to the Fan Lau fortress ruins and then north to Tai O through the Yi O village ruins and farming area. The terrain is fairly diverse as far as HK goes.
The hikehongkong guy is my main resource for finding trails, but he's screwed me a few times with his difficulty ratings. I've brought my GF along on some of his hikes and ended up having to listen to her (justifiably) complain the whole way through when it turned out substantially tougher than he implied. Still a really useful site.
I actually haven't been to Sai Kung much (or the northeastern parks in general) besides the place with the columnar rock formations. Probably because it takes a bit longer to get there, so it keeps getting downselected out of the options.