Fanny pack, ugly shirt, shorts with too many pockets, shoes (which look silly with shorts). Can spot the typical American tourist from a mile away. Euro tourists look a bit different, but still almost always dress the same as each other.

The gist of it is, tourists typically are carrying way more shit than they need and look silly more often than not. It's also nice to just walk around with the same amount of shit as you would if you were walking around your home city.