What is best way to roam around HK, is it by tour bus or using octopus card?

Hi, you can spend a day with Big Tour Bus there and for other three days, use Octopus Card or Airport Express Travel Pass to have fun by fully using the MTR, tram and bus in HK! To visit HK, you are highly recommended to take ferry to reach and the ferries are available at China Ferry Terminal and HK-Macao Ferry Terminal!

To start from Central, you can take Island MTR line to Sheung Wan and then walk to HK-Macao Ferry Terminal to catch a ferry!