Originally Posted by moondog

Taxi. The Lido hotel also operates a shuttle bus for y20, but it's schedule is not very frequent. You might be able to use it on your way back to the airport.

Another idea; consider checking out 798 instead of or in addition to the Lido area. I went there last weekend and was surprised by how nice it has become. You'll have enough time to do both (they are reasonably close to each other).

BTW, your airline's name is Air China.