When touring Hongkong, it is best to buy the Octopus card. It is like an ATM card that you swipe when you take the train or the bus. The Octopus card is very convenient since you need not grope for coins to pay the fare. What's best in the Octopus Card is you can refund everything when you leave Hongkong. That means you don't waste any cent. And using the Octopus card saves you in the fares because of the discount.
