I love the Big Bus Company - my 'go to' place when I am in a strange city to get a feel for the place. We booked a 48 hour ticket which we got for a 50% seasonal reduction (watch out for promotions, they are worth having). There are three routes, there is one which takes you out to Stanley, Aberdeen Harbour, Repulse Bay, another one through the Financial District and another route through Kowloon.. There are a lot of stops to hop off to go for a walk. If you get off at Aberdeen Harbour, watch out for their sampan to take you round the harbour. We also had a free ticket to Sky 100, the tallest building in Hongkong. There were lots of freebies included, you are spoilt for choice: Sky 100 (you would pay app HK $ 180 for the ticket), two return tickets on the star ferry, reduced coffee in Starbucks near the Star Ferry, reduced entrance fees. It's a great way to experience HK at your own pace.