We have taken our children for years to Negril starting at the age of 4. To them it was a giant sand box. A room with a kitchen has always been key to us.
Our first few years with them we stayed at Beach House Villas. Great property, small and well manicured. Very secure property and buildings. Food on site and other good places to eat very near. No pool but we prefer the ocean, pools in Negril have not been our favorite. We now stay at Idle Awhile. More expensive but bigger beach and better food. Also more shade at Idle.
The most important thing is how our children are treated in Jamaica.
We have always noticed that our children have been treated like royalty. They have really enjoyed their stays on the island so much that it is their favorite place to visit. Even after a disney trip they exclaimed they would have rather been in Negril.
Whatever your choice enjoy your stay and all the memories. Peace.