Siver,
Call the Peninsula and have them send a Rolls-Royce... ah, the only way to and from the airport... and only HK$700 each way
On a more serious note, overnight buses are probably the way to go... HK$10-HK$20, with service to Causeway Bay, Central, Mongkok, Star Ferry TST, and Tsuen Wan.
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preez mine da pratform gahp.