I agree with Mike, whom I thought put it the best. There are just too many wonderful places to visit and it really does depend on exactly what you're looking for. There's definitely something out there for everyone, that's for sure.
The only thing no one has mentioned yet is the ship. Sometimes, it's not the ports that are of interest to the kids, but the ship itself. As they always say, "If the kids are happy, the parents are happy!" So perhaps looking at something like the Oasis of the Seas or the Allure of the Seas, which are definitely a destination in themselves.
Let us know more about what you're interested in doing or seeing and there are plenty of great people here that will be happy to help.