You cant go wrong with the Antrim coast (north of Larne). Its all beautiful and great roads. Ballintoy harbour, Carrick a Rede rope bridge, Bushmills distillery and The Giants Causeway. There's a great restaurant in Portrush called the Ramore. Derry/Londonderry is worth a visit especially for a walk around the city walls. The Fermanagh Lakelands are beautiful. The County Down coast isnt as spectacular as the Antrim coast but its still worth a spin. Go from Newry to Hilltown then follow the signs to Kilkeel for one of our best mountain roads. You can follow the coast road back towards Newcastle where theres an amazing restaurant called Brunells. If you stick to the coast road theres a ferry across Strangford Lough en route north to Belfast. So there's a few suggestions to get you started.