Key points
Language
Chinese & English are the official languages of Hong Kong.
Currency
The official currency of Hong Kong is Hong Kong Dollar (HKD). 1$HKD=0.14USD
Weather
For the perfect warm, dry weather in Hong Kong, visit from October to early December. January to April is also warm and dry, but with more variable weather and fog.
Plugs
Hong Kong uses type D which has three round pins in a triangular pattern and type G which has three rectangular pins in a triangular pattern. 220V supply voltage and 50Hz.