Not sure but you might be referring to Bat Cave in Little Bay just a likkle outside of Negril. When I stayed there at the old Uncle Sam's we went exploring it and my Rasta friend told me that when Bob Marley used to live in Little Bay, Rastas used to gather there for candlelight "groundations". I can't remember any Rasta writing on the walls though but it has been about 12 years since I was there.
Here is a google search link that might help http://www.jamaicatravelforum.com/ca...le-bay-jamaica
Peace and Guidance