There are so many things to do in Northern Ireland. My highlights from 3 days in the country are the following. Day 1 you could visit the city Belfast. Visit the Titanic Belfast Museum, the Peace Walls in Belfast. Day 2 you can do a self drive tour of the Causeaway Coastal Route with highlights including the Giant's Causeway and Carrick-a-Rede Rope Bridge with a lunch in Bushmills. Continue your tour towards Dunluce Castle and Mussenden Temple. Day 3 visit the city (London)Derry. Visit the Troubles Memorials in the Bogside neigbourhood including the People's Gallery and the Bloody Sunday and Hunger Strikers' Memorials. Wander around the city walls and enjoy a drink at one of the pubs on Waterloo Street like the Peadar O'Donnell's pub. On you way home you might have a chance to see the Peace Bridge.