What should I pack when moving to Lake Atitlan?

We asked people living in Lake Atitlan to list three things they wish they had brought and three they wish they had left behind. They responded...

"Clothing for cold and warm weather, sturdy walking shoes, bug repellent and sunscreen for outdoor activities, a flashlight and batteries, a first aid kit, a hat and sunglasses, a laptop, a copy of important documents, and a water filter," said another expat in Lake Atitlan, Guatemala.

Other Questions:

What do I need to know before retiring in Lake Atitlan?
What do I need to know before moving to Lake Atitlan?
How do I find a place to live in Lake Atitlan?
What is a typical expat home or apartment like in Lake Atitlan?
What is the average cost of housing in Lake Atitlan?
How do I meet people in Lake Atitlan?
What should I pack when moving to Lake Atitlan?
Where should I setup a bank account in Lake Atitlan?
Will I be able to find a job in Lake Atitlan?
What is life like in Lake Atitlan?
What do people like (and dislike) about Lake Atitlan?
What type of social life can someone expect in Lake Atitlan?
What is the social scene like in Lake Atitlan?
What advice to expats in Lake Atitlan have about housing?
What are medical services in Lake Atitlan like?
Are healthcare and health insurance expensive in Lake Atitlan?
Is the cost of living in Lake Atitlan high?
What are the visa & residency requirements in Lake Atitlan?
Why do people move to Lake Atitlan?

What should I pack when moving to Lake Atitlan?

If you live in Lake Atitlan, newcomers to Lake Atitlan would love to hear your answer to this question.