yeesh. the choices are way, way too many.

Among them:
Singapore:
--the zoo (it's the best in the world)
--the night zoo (it's also the best zoo in the world and animals come a foot from you)
--the amusement park
--high tea at raffles

Malaysia:
in Borneo
--Orangutans
--Mt. Kinabalu
--Rafting
--Turtle Island (turtles come in at night to roost)
on mainlaind malaysia

Kuala Lampur
--tall building
--china town
--real bat cave
Penang

Thailand
Bangkok --almost anywhere
but including weekend market, kick boxing tournament, palace tour, river rides etc.
Koh Phi Phi or Krabi --snorkeling
Chaing Mai --trekking to see hill tribes
going to elephant camps

and i havent even got to Angkor wat in cambodia or vietnam.

actually there isnt much that would NOT interest kids of that age.