Hi! We, 2 adults & 2 kids are going to HK for 4 days 3 nights in middle of September & stay at Express by Holiday inn at Causeway Bay. Please advise the cheapest way of transportation during our stay, exp from the airport to hotel (2 ways)& also to Disneyland, Ocean Park, Ladies street , Temple street & watch the symphony of lights. Its advisable for us to buy the octopus card or to buy the MTR-Airport express with 3 days unlimited ride ? appreciate your help. Ths.