If you book one hotel in São Miguel, make it Octant Furnas. Set in the heart of the island’s geothermal valley, it makes the most of the Azores’ elemental pull from steam rising from the earth, mineral-rich waters, and a landscape shaped by fire. With one of Europe’s highest concentrations of hot springs on its doorstep, the hotel’s thermal pools (fed by natural spring water) are open 24 hours a day, both indoors and out.