Hi CanTri,
Your options around Whampoa Gardens are very limited. There are no paths around the Harbour that you can run on.
Fortunately it is very easy to get around Hong Kong and people are very accepting of people jumping on the bus/MTR/Taxi in sweaty running gear. I would recommend that you get on the East rail line out to Tai Wai and run around the Shun Mun river. It is flat and there is a path on each side.
If you like the hills, you can knock yourself out on the trails around Hong Kong.
You can get some more information on the AVOHK site
http://www.avohk.org/ or the HK Runners magazine site,
http://www.hk-runner.com/ Good luck.
Paul