How to avoid it: Before your trip, set spending limits and research the comparative costs of restaurants or attractions. You can also preload a debit card with the amount of money you want to spend. When you’re at your destination, Levine recommends using public transportation, because it’s a great way to save money and see a city. You can also check for any free or discounted activities or programs. Discounted travel pass programs, like CityPass, abound for big cities in the United States and other countries.