Things to do in Split Croatia. Split is a stepping stone into Croatia's beautiful Archipelago, an essential stop along the stunning coastline, and a portal into some of Croatia's incredible ancient history. The second largest city in Croatia Split, is a bustling seaside town built around a sprawling Roman palace on the shores of the sparkling Adriatic Sea. Welcoming around one million visitors each year, Split is a buzzing hive of activity, with tourists enjoying Croatian hospitality in the...