Pack one pair of shorts, several T-shirts or tank tops, and a swimsuit.
Pack one lightweight, long skirt when traveling abroad, if you're a woman.
Take a hat to protect your head and face from the sun. You may want to wear the hat while traveling to avoid crushing it in your suitcase.
Take one long-sleeved shirt or sweater. Keep in mind that hot days can turn into cool evenings.
Remember bug repellent, since most warm climates have their fair share of insects.
Pack sunscreen, lip balm and sunglasses.