This is a scattered site made up of a number of unconnected national parks.
There is a very informative Site Information office in the town of Murwillumbah, with very helpful staff. The town is served by buses travelling between Byron Bay and the Gold Coast, but trains no longer run there. We rented a car for a few days to visit the site.
The salient feature of the site is Mount Warning, named by Captain Cook over three hundred years ago. It sticks out like a thumb in the centre of a huge crater. We hiked though the bush around the base of the mountain. Because the site is sacred to the local Wollumbin people it is not recommended to climb to the top.
Great views of the whole crater can be seen from the rim of the crater. We found a great lookout up in the Springbrook National Park.