The largest island of the Azores archipelago is São Miguel. It is well worth spending a day in its comely capital Ponta Delgada. Characterized by striking black basalt and whitewashed Portuguese architecture, this compact coastal city serves a walkable urban base and starting point for exploring the island’s dramatic natural interior. Igreja Matriz de São Sebastião, the town’s landmark building. It’s built in a curious mixture of styles: originally 16th-century late Gothic, with a Portuguese Manueline facade and baroque features added in the 18th century. Forte de São Brás, which once protected the island from attacks by pirates. These days…