Watch your gestures

The wrong move with your head, hand, or foot can be a surefire way to get on a local's nerves, or even pick a fight. "We also fail to do our homework about space relationships," says Roger E. Axtell, author of eight international etiquette guides, including Do's and Taboos Around the World. "Latin America and the Middle East have smaller personal 'bubbles,' so you must refrain from stepping away when they move close."

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Dress respectfully

Classy everyday attire might have faded in the U.S., but it's always a good idea for tourists to look smart, says Whitmore. Conservative "global colors"--grays, blues, blacks--are generally safe bets. If you're going to a warm climate, avoid the temptation to pack only shorts and sandals. Include slacks and dress shoes, especially if you plan on dining at nice restaurants or visiting houses of worship.

Use clear English

Many people speak English as a second language, and it's hard for them to understand when tourists use slang and neglect to speak slowly. "We clutter our speech with jargon and sports and military terminology," says Axtell. "Try to stay away from idioms and slang, and watch for reactions to make sure communication is going well. Americans also forget to avoid phrases like, 'Hi, how are you?' in which we aren't really looking for an honest response."

Be a thoughtful guest

As in the U.S., if you're staying at someone's house or going over for dinner, bring flowers. Souvenirs from home--T-shirts, refrigerator magnets--are appreciated, too. Small gifts can smooth out everyday interactions. Marcel recalls the warm response when she handed out $1.50 bottles of Jim Beam to Russian officials checking passports on the trains. "It made the process a lot faster, and they looked out for me," she says. Gifts don't have to be expensive; as always, it's the thought that counts.