Hello, My daugher and 3-4 friends would like to take a cruise for Spring break. They are all 18 yrs old. They asked me to chaparone. We would divide up into 3 rooms/cabins. They thought that if we had adjoining rooms, it would be okay for the 18 yr olds to share a cabin, but it sounds like for Royal Carribbean, that would only work if I were everyone's parent/guardian??