‘Mouth of the Devil’ is an impressive vent or blowhole, where waves rush up a natural channel and blast out of a hole in the rocks. Car or motorcycle is the best way to get here – look for an unmarked dirt road 7km south of town and about 100m beyond the well-marked turnoff to Playa Rincón. Follow the road eastward for about 8km, then walk the last 100m or so.