Pack according to your destination and planned activities.
In all cases, consider including:
A swimsuit and rash guard
Lightweight clothing for warm weather
Long-sleeved clothes for sun and insect protection
A rain jacket
Comfortable walking shoes
Warm clothing and gear for mountain stays
In your first-aid kit, include:
Mosquito repellent
Sunscreen and after-sun lotion
Altitude sickness medication
Mosquito net and antimalarial treatment if visiting the jungle
And of course, don’t forget your camera — and perhaps a snorkeling mask to enjoy Ecuador’s underwater beauty!