L.I.
Welcome! I've been here over a year and even though its a small island there is tons to do here! I'm part of a playgroup that mostly hosts toddlers, but you could come before she starts school and pick some brains... its a group called Kinyoubi Kids (Friday's Kids)... http://groups.yahoo.com/group/KinyobiKids/
and if you're looking for a good website for information about the island, there's an extensive blog with everything from parks to restaurants to helpful tips...
http://www.okinawahai.com/