HALF DAY OPTIONS   Walking Tour of the City of Derry   Inishowen Penninusla and Greencastle Maritime Museum   Downhill and Mussenden Temple           FULL DAY OPTIONS   Giant's Causeway and Bushmills Distillery   Ulster-American Folk Park and Baronscourt   Glenveagh Castle and National Park   Inishowen Penninusla and Greencastle Maritime Museum           OTHER OPTIONS       2. FULL DAY OPTIONS: Inishowen Penninusla and Greencastle Maritime Museum The ancient territory of Inishowen, (The Land of the O' Dohertys), in County Donegal is a peninsula26miles in length and its greatest breadth is about 26 miles across. It is the most northerly part of Ireland and it comprises an area of about 309 square miles. Lough Swilly forms its western boundary and Lough Foyle its eastern. Monuments of an earlier age grow from the landscape as castles towers and ancient churches shimmer in the sunshine. The Celtic crosses and the pagan monuments come together in a colourful tapestry with these great houses of the last century, to leave more lasting memories for the visitor of this undiscovered part of Ireland.