Sure, you know what to pack—but how many of us do it last minute? The best way to avoid having too many bathing suits and no sunblock is to make a list beforehand.
Sit down and consider where you’re going, what the weather is going to be like, and what you’ll need for the circumstances. Any formal outings? Does it get cool at night? Sketch out your packing needs, then go over it for duplications and not-needed items. Your suitcase and/or carry-on will thank you for the extra effort.