Picture hills of cypress and olive trees tumbling toward water the color of sea glass, harbors lined with faded Venetian palazzi in sherbet pinks and sun-softened ochres. Welcome to the Ionian Islands, the green archipelago strung along Greece’s western coast, where the Mediterranean feels less Aegean and more Adriatic, and where centuries of foreign rule left behind one of Europe’s most distinctive island cultures. Their beauty is largely an ac…