Taxi.
It was a first for me and the kids going to HongKong. I must say I was quite surprised at how big it was, and how tall all the buildings were - I had imagined it more like Singapore, but it's like a maxed out Singapore, in a way!
The first day we took a cab to the hotel, and didn't do much more that day than go browsing the enormous shopping mall (Harbour City) and go for some ribs at an American restaurant, yum!