Most visitors to this site only visit the Naracoorte site, which is at the southern end of Australia with the Riversleigh Site up in North.  I visited the Naracoorte site in Oct 2021 with my wife.  Visiting Naracoorte was an easy visit via hire car with a number of caves and sites to visit which was quite interesting.  The Riversleigh site is a lot more out of the way and very much less awe inspiring.  If you only wish to visit one of the sites to tick this UNESCO site off, I suggest Naracoorte.  Riversleigh though was a nice adventure for myself and my son in April 2022 and it provided us an opportunity to visit a lesser travelled area and region.  The site itself lacks a lot of visitor information and consists of a small walk around the fossil site area.