The country of Ireland is roughly the size of the U.S. state of Indiana. You can travel from Ireland's most northern point, Malin Head in Donegal, to the most southern point, Mizen Head in Cork, in just over eight hours. Getting around Ireland is best with a car or a bus. However, there are many more options to get around depending on where in Ireland you plan to go.
In Ireland, people get around by walking, biking, driving, taking a bus, train, Lua (which is like a tram), ferries and planes. Depending on where you'd like to go and how long it may take to get there, walking is a popular choice. Not only is walking good for you, but it's free! There are many people who ride bikes in Ireland, another great way to exercise.
For longer distances or getting around a bit quicker, buses are the most common form of public transport throughout Ireland. Ireland also has trains but they're not like our subways. They're more closely related to the Long Island Railroad, in that they travel at ground level. In Dublin, in addition to buses and trains, they have a ground-level tram that looks like a shorter but modern train. They call them Luas. Luas, which is the Irish word for speed, are great to get to different parts of the city quickly.