We went to Oia, Santorini with expectations of a blue ocean in the caldera and lots of blue domed buildings, as seen in popular pictures.
At least on the day we arrived, June 10, a bright sunny day, the caldera sea was anything but blue. Our hotel was 2 minutes walking distance from the center of Oia and we had to hunt for the blue church domes - found about 3-4 of them. One had to go down a path off the main shopping street in Oia. Starting at 7 am in the morning, there were lots of to be married couples (mostly Chinese) with their photographer who lined up to take pictures in a very small area near the blue domes, hogging the area for 5-10 minutes at a time. They also trespassed on a hotel private property while taking pictures, which led to the owner (an old lady) getting upset and yelling for everyone to get out of there. From what we could tell, this is the area which appears in all (if not most) photos of Santorini with the blue domes.
We didn't find Santorini much more scenic compared to Hawaii or parts of California. Certainly if you're going to Greece, check out Santorini. I know our opinion probably differs from the vast majority, but thought we would share it anyway.