Another alternative is the Ngong Ping 360 Rescue Trail. It's a trail that goes between the cable car at top and the Tung Chung area at the bottom (where there is a mall, hotel, metro stop, Airbus airport buses, etc.). What I have done is take the cable car up and hike down...beautiful scenery, nice exercise, and good views of the airport. It takes about 2-3 hours depending on your pace. Not many people know about it - it's designed as a rescue path for the cable car, but is open to anyone at no cost. Basically, it more or less follows the cable car from the top until just before the cable car goes over the water. At this point, you can stand at the edge and have awesome views of the airport and active runways. And everyone on the cable cars points at you and you can practically hear them saying "what the hell is he doing walking?" At that point, it breaks off right and goes down in to housing areas.
In regards to the views being obstructed - In fact, I am writing this from The Pier lounge at HKG
and it's so cloudy/hazy that I can barely see Cathay City, let alone the cable car or hills! However, when I did it (it was winter time), it was clear as could be and beautiful weather.