I went on a 2 week cruise from Sydney to the pacific islands and back.. it was great value and quite fun in a way, but I discovered i'm more of an unorganised traveller, and I really felt annoyed going to shore along with 1800 other punters, flooding the tiny little town/island/country/beach ...
also I felt awkward not driving or even riding in a car for 2 weeks
(bar 30 ish minutes in a "taxi")