[Arubalisa]

I don't know how much children that age would enjoy seeing specific sights. How about renting a car for the day and making stops at the

• butterfly farm
• donkey sanctuary
• and ostrich farm

Afterwards you could stop at Baby Beach or Arashi for swimming or Boca Catalina for some easy shore snorkeling.

For something much more adventurous http://www.aruba.com/forum/f10/anyone-take-tomcar-tour-yet-36240/