Hi liveforever,
From Hong Kong airport, go to terminal 2 and look for Eternal East Cross-Border Coach counter. They are the only coach provider to go to Huizhou from what i know. The URL is
http://www.hongkongairport.com/eng/t...-services.html. If i remember the price is about 200HK dollar per trip and the time frame is from 0800 to 1900 only. So make sure your flight is within that period else there is no coach services to DS.
Buy with them a return and check with them the dropoff and pickup point. I am not too sure about DS as most of the time i hang around HZ city.
Hope that helps.