If you're staying for 2 nights, then you may want to consider a hotel in the city rather than by the airport. More time to see the night lights by the harbor and wander in the night markets.

Lots of things to do in HK for your full-day that the kids may enjoy - besides riding the Star Ferry and Peak Tram, also going to the bird market in the morning, riding the HK Tramways on HK Island. Or perhaps even going to Ocean Park with just opened a new huge aquarium and has a pair of pandas.

Early December is the best time to visit HK. Weather is best, and most of the Christmas decorations in the malls and outside buildings should be in place.