Macau!

Macau is a small island (or group of islands) that's an hour-long ferry ride from HK.  Vin recently ran a half marathon there:

Macau Fun Fact #1:
Like HK, Macau is technically owned by China, but functions as its own country.  It was founded by Portugal and so has incredible Portuguese food - especially at Fernandos:

 
Macau Fun Fact #2:
It's also the gambling mecca of Asia - complete with gargantuan casinos from The Wynn, Venetian, Hard Rock and others. Steve Wynn was recently quoted as saying Macau is where the future of gambling is...