Learn a new language
The app: Duolingo
Don't worry, this is a far cry from your high school french class with Madame Megabitch. Instead, Duolingo gamifies each short lesson, guiding you from basic vocab to more advanced conversational skills in a way that doesn't feel like work. At the very least, if you're headed to a foreign country you won't horribly embarrass yourself the minute you land.
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Joe McGauley is a senior writer for Thrillist. His favorite carry-on item is Xanax.