Know Before You Go
There is the option to take a shuttle bus from the visitor centre to the coastal area to explore; otherwise there is a 15 minute walk down the sloping landscape to get to the Causeway.
The Causeway is free to visit. You do need to pay to enter the gift shop and visitor center. The cost can be found on their website, https://www.nationaltrust.org.uk/giants-causeway. Pre-purchasing tickets can save you a little money on your trip. Sensible footwear is recommended, and a warm jacket; the coast is generally always colder than expected!
Car parking at Causeway is for the visitor center. Other less expensive parking can be found at the nearby train station or in a field owned by a local farmer that opens during the summer. Alternatively, there is parking in the town of Bushmills and a shuttle bus goes back and forth to the causeway.