Santorini is a natural wonder. There is nothing like this anywhere in the world. The way villages are built right on the edge of the caldera is fantastic! Fira is the crowdest of the villages but it also has most amenities, including most bars. Oia is the picturesque village to enjoy the sunset from Franco's Bar. The other tourists might be a little annoyning in this romantic atmosphere, though try to focus. I think Santorini is the ideal place for couples and honeymooners, the big companies and their noise actually spoil the beauty of the island.