If you want to stay very close to the Hong
Kong airport, there are a couple of hotels that will meet
The Regal Airport Hotel is one that you can just walk over in
3 minutes down the covered walkway from the airport terminal.
Usually they even have a day rate if you want to just stay for
a few hours.
Then there's also Hotel Novotel Hong Kong Citygate. Although
it's not as close, it is still just a 5 or 10 minute ride in a
taxi or their free shuttle.
Then there's Hong Kong SkyCity Marriott Hotel right next to the
Expo, which is just one train-stop from the airport, a ride
of less than 5 minutes. (2009.6.11)