I just returned home from a long weekend on Nantucket for Thanksgiving. Even though I grew up in Boston, I had somehow never been to Nantucket before this trip! The island is full of traditional Cape Cod-style houses: low, symmetrical cottages with weathered shingles or wood clapboard siding. During the 17th and 18th centuries, Nantucket prospered inordinately as the hub of the whaling industry; but by the mid-19th century, whaling was in decline and a large fire destroyed most of the island’s earliest buildings. Jethro Coffin’s house, known in typical straightforward New England style as the “Oldest House,” is Nantucket’s oldest house still standing in its original spot and one of the few structures to have survived the devastating fire. Built in 1686, this saltbox house features a distinctive horseshoe design on its central chimney. I spent several days poking around the little shops in Nantucket Center. As it turns out, Nantucket has a notable retail history; R.H. Macy, founder of Macy’s department store, was born on …