This is about to sound like the sketchiest way to exchange money, especially in a foreign country. Our tour guide told us while we were at a big parking lot, that there would be a black car that would be away from the bus. Each person needs to go by themselves and walk to the car and go up one at a time and exchange money.
If that doesn’t sound sketchy I don’t know what will. Well its actually a funny story because the black car ended up parking right next to our bus and then it wasn’t a big deal to exchange the money at all, nor did it seem weird.