I love taking images from relatives / friends, when they are not aware that I am taking an image. The looks are just so more real, instead of the "Fake smile for the camera". Now I am going on vacation and wanted to do the same with natives, but from what I read and understand, you are not supposed to take images of people who do not know they are being photographed.
So how do you solve this dilemma? Take images of people not knowing they are photographed, yet asking people if you can take an image?
Acquire an image, ask them if you can take one, if they say yes, do another shot with them aware, if they say no, delete the first image?