ROYAL CARIBBEAN Oasis of the Seas | Best Activities for Kids. Thinking about taking a cruise vacation with the kids? Wondering what type of kid activities are offered on board? Check out the fun activities with the Baby Gizmo and Junior Gizmo kids that are included in a Royal Caribbean Oasis of the Seas cruise vacation. Yes, Oasis of the Seas just happens to be one of the largest cruise ships in the world!