Before I homed in on Po Toi, I used to go regularly to Kuk Po via Nam Chung (56K from Fanling MTR as mentioned by John) and Luk Keng around the coastal path.
It's a really pleasant walk and Kuk Po is very interesting to wander around - lots of derelict old buildings, a good marshy area and quite good for birds although I don't remember Oriental Greenfinches then. Very quiet, hardly any people, especially during the week - my kind of place.
The walk to Wu Kau Tang was a bit far for me, I only did it once.
[ Last edited by wgeoff at 19/10/2010 18:10 ]