Martha's Vineyard, the largest island in New England, illustrates the quintessence of unspoiled Cape Cod landscapes: pine and oak forests, colored buffs, vast sandy and pebble beaches, seaside resorts and fishing harbors. In the summer, it acquires a sort of idyllic island atmosphere as the East Coast's wealthy urbanites flee stifling New York. Its permanent inhabitants prefer it in fall, when the Indian Summer foliage turns a riot of color.