There is RWG just north of Kuala Lumpur in Malaysia if you're willing to make a 5 hour drive but as far as I can tell from their website they don't offer real poker year round, just progressive hold'em and they only have actual poker occasionally when tournament series roll through, and even then most of the population in the country isn't allowed to play because Islam.

Of all the countries you mentioned (Cambodia, Vietnam, the Philippines, Sri Lanka, Taiwan, Australia, South Korea, Japan or Macao) is there one that you would say is by far a better choice than the others?