From Belfast head south on the A24 until you reach the village of Clough. From there, continue south along the A2. From Dublin take the M1 to Newry, take the B8 (signs for Hilltown) then continue along the A25 towards Castlewellan. When you reach Castlewellan, take the A50 to Newcastle.
There are no train services to Newcastle so the best way to get there is by bus. Ulsterbus runs a service from Belfast Europa Bus Centre to Newcastle Bus Station every 30-60 minutes and takes around 1 hour to 1 hour 15 minutes.
The most convenient airport to Newcastle is Belfast City Airport, around 1 hour's drive away. Belfast International Airport is around 1 hour 20 minute's drive away and Dublin Airport is around 2 hours away by car.
Newcastle has many different shops and stores
Newcastle has a Mauds Cafe and many other cafés and fast food outlets along the seaside.