I think if you search the archives the question on needing AC comes up and is debated in a thread every few months. You might also take a look at my write up for my boat regarding AC that can be found here:
Do you need AC?

Second I think there has been some assumption in this thread based on your post that you are looking for a Cat. My recommendation would be to charter whatever configuration you have experience with. If that's a mono charter a mono and if a cat charter a cat. And be realistic about the size of boat your are comfortable with. Two adults and 3 small kids you will fit onto just about anything available. Sailing in a new area can be enough anxiety - you don't need to add to it by chartering a larger or different configuration. You are there on vacation and your goal is to have a good time doing it.