Hi Mate
Hacienda Del Alamo has plenty of swimming pools, childrens parks with swings and slides etc.
You have not said where you are staying on the resort. Our apartment is on The Oasis where there are 4 pools, and childrens pools, tennis courts etc.
For entertainment The Spaniard Inn will suit your children with meals and ice cream, where the golf club is more formal but does serve pizza and ice cream outside on the terrace.
Hope this gives you a little more information, but remember Los Alcazares and the La Manga strip are only 20 to 30 mins away if you want a beach. Los Alacazares is better for children.
Enjoy your stay !
Garry