Prices in Guatemala are very reasonable. You can pick up a one-plate meal for less than US$2, or stuff yourself on almost-free fruit and snacks from elaborate markets. Camping is incredibly cheap, and bus trips cost around US$1 an hour. Even if you splash out on a few comforts, you should be able to get a room with a bathroom, plus two or three meals, from US$25 on up a day.

It's a waste of time trying to change anything other than US dollars - even currencies from neighboring countries will probably be difficult to exchange. If you do have a different currency, try the casas de cambio (currency exchange office) at Flores or Guatemala City airports. You'll find ATMs for Visa/Plus System cards in all but the smallest towns, and there are MasterCard/Cirrus ATMs in many places too, so one of these cards is the best basis for your supplies of cash in Guatemala. In addition, many banks give cash advances on Visa cards, and some on MasterCard. You can pay for many purchases with these cards as well as American Express.

Waiters expect a tip of around 10%, on top of the 10% IVA (value-added tax). Hotels charge a 10% tourist tax in addition to the 12% IVA. Most hotels and shops have fixed prices, but you'll be expected to bargain at markets - remember to keep your sense of humor and perspective.