REAS is a package of "goodies" for grownups. It stands for Romantic Excursion at Sea or something close to that. The price includes a couples massage, dinner at Palo, champagne breakfast, gift in cabin, etc.
The biggest part of the deal is that you can book your spa reservations, Palo reservations, and breakfast in bed morning in advance thru a delightful lady named Debbie. You can also specify which dinner rotation you'd like (it matters to some people).
So...is it worth it with a child? How romantic are you going to be with a small child? It is a grown up present, not a kiddie thing!