I would definitely recommend the Tamarijn. The atmosphere is great, and the staff is so friendly. There is a kids' camp for kids age 5+, and an arcade. There are great restaurants (including paparazzi, my personal favorite), and you couldn't ask for a better view!
If you are considering the Tam, I would recommend visiting their webpage at www.tamarijnaruba.com. They're mighty friendly there... it's just perfect for your family!