Buy an Octopus card at the airport, put about $500 HKD is reasonable: Arriving by Air – Octopus Hong Kong
From Airport to Hong Kong Island: Take Airport Express Train to Hong Kong Station.
Buy an Octopus card at the airport, put about $500 HKD is reasonable: Arriving by Air – Octopus Hong Kong
From Airport to Hong Kong Island: Take Airport Express Train to Hong Kong Station.