Weve done 2 and soon a 3rd New Years cruises on Royal Caribbean. We have a 2.5yr old son. People, including kids have said they really like the kids club on RCI. Some kids say they liked it better than Disney. As long as the child is 3 and potty trained they can use the club. The other + with RCI is the activities they have on board:rock wall, ice skating, inline skating, basketball, mini golf, arcade, pools. There are no added fees, except for the arcade to use these facilities. Just be sure if you do go with these ships that you bring long pants (ice skating reqs) and socks (ice skating, inline skating, and rock wall).