The local grocery store is invaluable. However, if you aren't PADI certified and have to take the resort course note that it's only offered three times a week, Sunday, Tuesday, and Thursday. If you plan to take it, do it the first day possible. Also be aware that you can't dive and fly in the same 24 hour period because of pressurization. There are a whole slew of activities planned through the mini club from swimming, to goat races and shell hunting on the beach.
Older children go on bike rides, and learn to snorkel.
In the evenings they have their own meal time. Plan on paying your Friday for her services every night, but note that most of them must take the public bus home the last of which leaves at 1 A.M. on weekends and at midnight during the week. She will have to spend the night if you are going to be out later. So, the last night of our stay we gave her an 'extra something' on the side. Most of the other families we talked with were doing this as well though some repeat travelers had brought appropriate gifts from the States.