What the Return Traveller Wants
This traveller already has a general sense of Portugal's geography and character and does not need an introductory itinerary. They want depth on a specific subject, access to places well outside the standard tourist route, and a guide capable of engaging with a traveller who already has informed opinions and questions.
They also tend to appreciate the interior of the country — the Serra da Estrela, the Alentejo frontier towns — over another pass through familiar coastal cities.