HKG is a good stopover city. Lots to do and see.
You have a couple more segments you can use in Asia and SWP. If you want to relax in a paradise for a few days and then see one of the most modern cities in Asia consider NRT-HKG-DPS-SIN-BKK. If you want to see some more of Oz, try AKL-SYD-PER-DRW-CNS-NRT.