There is a kiddy pool next to the pools on both the Luna and Mares side.
For those who haven't checked out this site, you will find many, many pics of the resort. Unfortunately the commentaries are all in French, but a picture is worth a million words and if you want me to translate, don't be shy. Go to:
www.voyagesarabais.com Click on VAR in French (if you click on English you will still get the description in French).
Click at the bottom of the page on Videotheque. then Holguin, then Sol Rio.
Near the top, you can click on several categories, such as Site, Plage(Beach), Piscine (Pool), Chambre (Room), Restaurant, Bar, Animation (Activities). You will see many pics of all areas that will give you a great idea of the set-up. Hope this helps.