English is the primary language, although you may find it a challenge understanding as locals talk very fast and have a distinct accent from the rest of Ireland.
Most visitors will arrive in Belfast City Airport or Belfast International at Aldergrove. While 'George Best City Airport' is right in the city, the International is 20 miles away by Motorway, so plan your transportation accordingly.
There is a limited bus service between several towns in County Down, but many must connect in Belfast.
The best way to see around is to hire a car, as distances are far too great for cycling.
The Ards Peninsula has many 'typical' Northern Irish towns which are interesting to travel around.
Visit the Mourne Mountains. Trek the mountain paths for nice rivers and a great view over Newcastle towards the top. Alternatively, drive around them for wonderful scenery (on a good weather day) and quaint mountain walls before reaching Silent Valley and looping back around the other side.