Hi,
Were staying at the Gala the last week in July with our 3 kids 7, 7, & 9. One of our concerns was that the age group for the kids is split between our kids ages. Also some of the web sites that describe the Gala indicated that the younger group (I believe it is 2-7) does not go outside of the kids club.
We discussed this with our travel agent. They told us if we were comfortable with the younger kids experiencing some of the activities outside the kids club with the older group that the staff would have no problem allowing this. The agent confirmed this with a email to the resort.
There is a pretty good discription of the kids club activities at the following link
http://locogringo.com/playa/gala4.html
Hope this helps.