Originally Posted by DernierVirage

I suggest that you jump on the Airport Express and take the train into Central (get out at the terminus, Hong Kong Station). Costs HKD 100 each way and takes 25 minutes (again, each way). That way, you can actually get out a bit, even see Victoria Harbour etc. If you have up to four hours, there is no problem and, with a bit of research, you will actually be able to at least see something of the city.