In Oia, at sunrise, all kind of amazing photography opportunities await. I know the thought of waking up early is daunting but take it from me, it's worth it. You get all the beauty with none of the tourists. And the sky is unbelievable.
Oia is a hard place to photograph during the day due to the very strong sunlight reflecting off the white buildings. But at sunrise the lighting is soft so you can se all the pretty colors around Oia. Sunset works too but the problem with that is the swarming tourists who seem to compete for the best click.