Fly into Guatemala City. The airport’s clean, modern, easy to navigate. Don’t change your money there if you can help it. The kiosks here give the worst exchange rate in the country. Bring US dollars to change, or use your ATM card to get cash.
A word on safety here: Follow basic precautions. Lock up your possessions when you leave your hotel room, keep your passport in a hotel safe, and don’t display flashy, expensive gear. Don’t walk alone at night or loiter in remote areas in daytime without a guide.
Getting to the Lake