We have an 9hr afternoon stopover in Hong Kong - ideas please?

Hi
Our plane lands HK 11am - leaving 8.30pm Oct 31st 2013. We would like to see as much as possible of the area in this short time. We are senior citz and having never been there before really would like to hear from anyone who has been on or knows about a suitable tour.
Could we be picked up and returned to the airport?
Thank you very much