Where can i find a free map online indicating the aboriginal rock art
and cave art sites at the 'royal national park' in Sydney, Australia?

Here is what one site about walks in the park says:

" The bush walker can catch the Bundeena ferry and walk to Jibbon
Point which is at the end of a one kilometre beach track from
Bundeena. The appeal of this walk is that it passes some fascinating
Aboriginal rock platform carvings of sea creatures. Given that most of
the Aborigines had left the area nearly a century ago, and that just
across the water the suburbs of modern Sydney can be seen, this is a
powerful reminder that long before Europeans arrived the Aborigines
lived an idyllic life in this area."

I reckon this is to the east.  Here is a mapsite for Australia that
should help you:

http://www.lands.nsw.gov.au/AboutUs/OurOffices/sydneymapshop.htm