Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
Santorini emerges as the optimal May destination with an overall TripTiming Index of 70/100 vs 66/100 for Athens (+4 point advantage). Santorini provides superior civic predictability and tranquil urban sightlines (83/100 vs 64/100). This is reinforced by attractive lodging rates (~$401/night).