Ribadesella

Ribadesella needs 1 day: touring the Tito Bustillo Cave, with Paleolithic cave paintings declared a UNESCO World Heritage Site, and its Santa Marina beach facing the old town, in a single day. June-September brings the best weather, though cave access is limited to a daily visitor quota best booked in advance. It's mid-priced. It's the finish line of the International Descent of the Sella, a century-old canoeing competition that gathers thousands of participants and spectators on its banks every first Saturday of August.