Aiya Napa and Ibiza are the more expensive, that's for sure, but if you're looking to go to the big, famous clubs, they're the ones to choose! All of these places attract the '18-30s' crowd, so the majority of the crowd are young, say from 18 to early 20s. You won't have any problem finding 18-year-olds in any of these places. My favourite of these places was Zante, and my least favourite was Ibiza, just because it was too much! To be honest, they're all pretty much the same kind of thing.