19. Honestly, just complain incessantly. Raise complaints to a high art.
Misery loves company, so naturally your company must be fascinated by your misery. Let us all in on your most reflexive, diuretic dislikes. Complain that the A/C’s too cold, the flight is too long, the exchange rate sucks, the hotel lobby’s too sketchy, the manager’s an idiot, the room is too small, the view could have been better, the food is too spicy, the wine isn’t chilled enough, the market is too crowded, the taxi smells bad, the locals don’t speak English. Complain, in fact, until everyone else starts complaining on the sly about you.
20. Be a full-on unholy ungrateful nightmare.
There are people out there who like to travel to encounter new things and open their minds. If you’re with those sorts of people, all you have to do to ruin the experience is grind your heels into the dirt like a mule, or a 5-year-old.