In 2002, my mother-in-law took us on the 3-night Bahama cruise on the Wonder. For the amount of money she spent, we went into it thinking, "I wish we'd just go to WDW instead!"
BUT, we ended up LOVING it! Constant activities and fun for every age. Yet, if you just want to relax, plenty of opportunities for that too. Same Disney touches that make it a fabulous experience for guests.
We have since returned for a "Land and Sea" package, and someday, when we have it in the budget, we will go again.
I've been on five and they are the most AMAZING MAGICAL things EVER I love them! They're not "in your face" Disney and there are nice little touches that make it great.