try hppa playgroup. depends on where you will be staying. they have a number of locations. you can also see what is available for your 3 year old at:classmateasia.com. but this is more for those who expect to be around for the full year.
there are alot of options for general activities: arts and crafts, gymboree, kindyroo and the like for a child who is not around for the entire school year.
good luck