Maui, more stuff to do, cool aquarium, good snorkling, Haleakala(kids might not dig this too much, freakin' cold at 10,000 feet when the sun is coming up, even in the tropics.
Hale Pau Hana on west coast of island in Kihei, condos with kitchen, beachfront. Depending on how many people they have a large suite with a private patio overlooking the sea, facing Molokini.
http://www.hphresort.com/
folks go every other year