For information on what to do in Hong Kong, perhaps take a look over at the Hong Kong and Macau forum here on Flyertalk?
http://www.flyertalk.com/forum/hong-kong-macau-436/
There's this thread as a sticky that may be a good start:
http://www.flyertalk.com/forum/hong-...e-what-do.html
I've only been there once, for a 2-night mileage run/mini vacation. I took the train to the peak, then walked down. Only the walk down ended up in disaster as I was overcome with food poisoning.
I'd also recommend taking a ferry across the harbor. I did this at night, and the lights are amazing.