Any question answered...

Have you been to HK before?
if not, ensure you leave the airport with a bottle of water.
Airport Express Train into Central.
As a Man of cultured tastes you probably want to have a look at Richard Rogers HSBC building. (Free escalators from gound level ino the atrium/reception area).
Walk to Ferry across to Kowloon, (ferry terminal has been re-located, but the old ferries till plough across what is left of the (repeatedly infilled) Victoria Harbour.
In Kowloon note all the guys offering you hand made suits in 24/48/72 hours.
If rested, wander over to Chunking Mansions:
https://en.wikipedia.org/wiki/Chungking_Mansions
Get the MTR metro to Mong Kok.
https://www.google.co.uk/maps/place/Cordis,+Hong+Kong/@22.3180306,114.1691173,17z/data=!4m5!3m4!1s0x340400c784bc08cf:0xcad7219666b937d7!8m2!3d22.318239!4d114.168141
Note Langham Place tower block/shopping centre with international coffee franchises in the public spaces. Other side of road leads to Tung Choi Street for the 'Ladies Market',
(really just an all day street market), for all your counterfeit needs. The cafes 'behind' the stalls are fine to eat in, just don't expect English to be spoken everwhere.
The foul/sewage smell sometimes signals edible street food, (I think it is boiled, aged tripe that gives the distinctive smell, but all the rest is fine). As are the places offering fresh fruit juices while you wait.

Walking takes much longer than in London, partly due to the sheer volume of people, and their inability to walk in straight lines.

Wander around the street grid and return to Mong Kok MTR back to Central and the Airport Express. You will have to be back at the Airport before the nightly, 20.00, lightshow
http://www.discoverhongkong.com/uk/see-do/highlight-attractions/harbour-view/a-symphony-of-lights.jsp