Actually that is not quite accurate. The daytime children's activities are scheduled until 5 PM - then there is a dinner break for the staff - and evening activities are scheduled again from 7-10 PM. After that, from 10 PM - 1 AM Adventure Ocean is also open for late night activities/babysitting - but there is a $5 per hr. charge for that.
RC's Adventure Ocean programs run everyday and are manned by a qualified and energetic college-educated staff. The child to staff ratio varies depending on number of children on board. Personally, I believe them to be one of the best in the undustry.
You can check out a sample of the various daily programs available for both a Day at Sea and a Port Day at out parent site: CruiseReviews. Here is the link to the RC page:
Just scroll to the bottom of the page and click on the age group(s) of interest.