It really depends on what you want out of it. Looking at what you've said so far, maybe it's something like a week exploring a city or two and then a week in a resort by the beach relaxing?
I would definitely visit Hong Kong. It's an easy place to get around and plenty to see then maybe visit to Singapore and then ferry across to Bintan in Indonesia for the beach part of it. I would suggest:
5 days in Hong Kong including visit to Macau (stay in one of the casino resort hotels)
2 days in Singapore
4 days in Bintan (beach bit)
Back to HK for a day or so and then flight home.
We stayed in an Angsoka Villa at the
Bintan Lagoon Resort and it was fantastic. Golden beaches was just 20 metres from our private pool