Check out this thread from a couple years ago… Croatia: wines of Dalmatia...
If you are in Korcula, definitely have a meal at LD and definitely try the Krajancic Posip Melaina/Statut - I believe LD is the only place that gets this wine. Was there last month. Similarly, if you are near Sibenik, dine at Pelegrini and do their pairings. They have some really cool exclusive wines (at least they did 2 years ago). And reserve a meal (and tasting) at Bibich in the hills outside Split.