Thanks for the all the thoughts and recommendations - keep them going.
Travelling tonight and will be there tomorrow.
I've been to HK 3 times on business for 2-3 days and didn't feel like it I did it justice (couldn't extend unfortunately). Not sure I will be in the mood to spend a few hours going into town - but may well be. At the moment, feeling pretty lazy and tired but I guess I can get plenty of sleep on the flight over.