At 3200 square feet, it’s not really a cottage. But the Spouting Horn Cottage on prime oceanfront in Poipu feels pretty cozy just the same. Each of the three master suites has an blue Kauai ocean view of to die for. Cottage decor is retro classic Hawaii, with canoe paddles on the walls, dark wood furniture, four-poster beds, and other nice touches. You’re steps to the water, an easy walk or paddle…