Santorini is an awfully popular place, but even it can be quiet during the off-season.
Personally, I really preferred it quiet and nearly empty (late February). No trinket shops were open, the open restaurants were ones the locals liked, and we had no crowds to deal with.
Olympus E-M1III, M.Zuiko 8-25mm Pro lens
f/11, 8mm, 1/320 sec, ISO 200