Answered by Babala
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Nov. 19, 2015 21:38
As I know, there is no N22 bus in the city. The N21 bus passes by Mirador Mansion, and you need to get off at Cameron Road, Nathan Road Station. The bus is available from 00:20 to 04:40, and the fare is HKD 23.
I am afraid that you cannot buy Octopus card at midnight. In daytime, it can be purchased at most MTR stations.
If you are going to take airport express, then airport express travel pass is recommended, which contains one or two airport express ride plus three connective days free ride on most MTR. On the fourth day, you can top it up to function as a Octopus card. If not, you are advised to buy Octopus card, with which you may take MTR trains and buses at certain discount.