Nourlangie is a series of rock where indigenous people used to live for tens of thousands of years. It is also home to some terrific rock art, and a reasonable view. It is very accessible, all the time. The walk is really easy. As a consequence this is sort of place you will go once and love it, but end up taking every interstate visitor to a million times. It sort of lost its sheen with me, but if you are in Kakadu once, and you are interested in the ancient rock art, it is it worth it.