Ok I have two of my children (10 and 11 years old) in PINTO Sommercamp. Its arranged by New Horizon schooling Santo Domingo.
Go to the website of New Horizon
GC New Horizons > Inicio look for Rancho DON REY. It is located in Sabana de la Mar.
Starts every friday, the children are transported by bus from the New Horizon School in SD.
I paid for 2 children for two weeks some 50.000 Peso. Its for children from 8 to 14 years.
The children are very happy their a lot of entertainment.
I hope that will help you