The weather in middle of Sept. is pretty enjoyable, there is little rain or hot weather, it is very suitable for a visit.
You can take A11 from Causeway Bay to HKIA,there is stop.
To Disneyland, you can take Subway Island Line to Central Station and then take Tswen Wan Line to Sunny Bay, then take Disney Resort Line to your destination, it costs HKD24 per person.
To Ocean Park, you can take Island Line to Admiralty and change to Bus 629 to the terminus.
To Star of Avenue, take Island Line to Central and Walk to Star Ferry Pier, take star ferry to Star of Avenue.
To Mong Kok computer center, Take Island Line to Admiralty and transfer to Tswen Wan Line and alight at Mong Kok. Ladies street is very close to computer center.
To Temple Street, take Subway Line Tswen Wan and alight at Jordan Station, and then walk to Temple Street.