The medieval villages of Ston and Little Ston, its smaller neighbor, are completely connected and sheltered by a wall more than three miles long. Built in the 14th and 15th centuries to defend Dubrovnik and to guard Ston's prolific salt pans, they are the second longest chain in the world after the Great Wall of China, and the longest-surviving defensive walls in all of Europe. Walk them, glance down, and be rewarded by spectacular views of the Dalmatian coast with its rocky outcrops, hillsides covered with olive trees, rolling green fields, and red-roofed buildings. After this feast for the eyes, the taste buds clamor for attention. Climb into a rustic boat with your guide, who will motor out to the oyster and mussel beds, and learn why Ston has been called the oyster capital of Croatia. Of course, a sampling is an absolute must - it simply doesn't get any fresher or more slurp-it-down special than this. With oysters serving as an amuse-bouche, you'll move on to the seaside Bota Sare restaurant, located in the shadow of a former castle. Within its stone walls, indulge in the seafood for which this region is renowned, as well as freshly baked breads, black risotto, and other specialties, complemented by a local wine. Winemaking is a 2,500-year tradition in Croatia, a small nation that nevertheless boasts more than 300 wine-producing districts, and it generates some excellent bottles. This tour is provided by an operator that has been third-party certified to meet the Global Sustainable Tourism Council's Criteria for Tour Operators.