Things to do for kids in oriheula costa

Hiya,

I am trying to convince my sister in law that it would be great to holiday in our apartment when it completes next year - in DH2 near punta prima, playa flamenca, etc

usually her and my brother and their 11 year daughter go to hotels that have kids clubs, but obviously they are costly

so i have suggested they go to us, at no cost to them other than their flights, etc, but it is taking some convincing as i dont know the area that well and what there is to do

any help would be greatly appreciated

regards

saznaz