The Causeway Coastal Route is full of adventure—walk the cliff-top ruins of the 16th-century Dunluce Castle, or explore the basalt rock formations at the Giant’s Causeway. Game of Thrones fans can check out filming locations like Ballintoy Harbour (The Iron Islands), or Downhill Beach (Dragonstone). You can also explore different options for camping near Portstewart on Hipcamp.