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I think Celebrity would be a good choice for your group, it has things to do that would interest your group. I would stay away from the Zenith and Horizon because they are more layed back and I think some of you would not find enough to do. They are very nice ships, I don't want you to think they aren't, I am just thinking about activities and night life.I think you would like the Millennium class ships as they have a wide range of choices for your group to do. Which ever you choose I hope you all have a great cruise :wave