+1 for PerthMTB (incidentally, Perth this weekend, anywhere to MTB?)
If Steve is not available I have a spare bike and am near the Airport.
If not riding try this compact trip suggestion:
1. Catch the ferry across Victoria Harbor from TST to Central ferry Terminal
2. Walk through Central to the Peak tram
3. Get the Peak Tram up to top
4. To to the top of the Peak and take some pics of HK below (classic shot)
5. Walk down the morning trail into the mid-levels, have a beer or two
6. If your near the Harbour at 8pm, go watch the light and laser show
The HK Express train at HK MTR Station should get you into the airport in 20 minutes.
That should keep you busy, if you want to see, do or eat anything specific let me know, HK local.