Benchmarked strictly across TripTiming's 5 empirical pillars: Crowds, Weather, Vibes, Prices, and Safety.
Faro (Algarve) emerges as the optimal May destination with an overall TripTiming Index of 73/100 vs 64/100 for Lisbon (+9 point advantage). Faro (Algarve) experiences substantially lower visitor footfall and shorter landmark queues (heavy visitor congestion vs peak seasonal crowding in Lisbon). This is reinforced by lower lodging rates (~$200/night vs ~$307/night, saving ~$749 over 7 nights).