I am planning on going to KUL and Phuket staying one week in each place in december with my wife and 2 boys ages 4 and 1.
My son loves Angry Birds so i will take him to the theme park but what else can we do during this month?
Have you had a look at 'things to do" at the top of the page?
As SurfingWild mentioned, please look at the "Things to do" page at the top of the respective destination forum pages.
AFAIK there is no Angry Birds theme park in either KL or Phuket. The only one I could think of is in Johor Bahru, 4 hours away by road or 50 mins flight from KL.
If you are doing Angry Birds in Johor Bahru , perhaps u can include Legoland as it is nearby..