Yes, all guests will need a valid passport to enter Guatemala. U.S., Canadian, EU, and many other passport holders do not need a visa for stays under 90 days. Check with your local Guatemalan consulate if you're unsure.
Sunscreen and bug spray Lightweight, breathable clothing A light jacket or sweater for evenings Travel-size meds (motion sickness, Imodium, etc.) Power adapters are not needed if you’re coming from the U.S. (Guatemala uses the same plugs/voltage)
Most major carriers offer international plans. Alternatively, you can use WhatsApp over Wi-Fi or buy a local SIM card at the airport or in town.
The currency is the Guatemalan Quetzal (GTQ). Credit cards are widely accepted in tourist areas, but smaller shops and markets prefer cash. ATMs are available in cities and larger towns.