Middle level is a bit difficult. From the cliff path down you will see it divide with one route down, the other level. The level will go inwards into the cove, still at height, and the original path gone, so now its a traverse over to where you will see like coal, a dark patch. You will know it when you see it. Alternative is to handline down the incline from the top.
Top level is difficult to find if you dont know it. Its on the other side of the left hand side of the cove, if you can follow, in the back of a sort of quarry.
Years ago when I was doing all these, I thought I was pretty cool at it. One path down to "the mine of radioactive fish" I circumvented by an easy way, only to see a party coming down the path of death with kids on their backs.
Seen this again since, I suppose they grow up in the area and it becomes second nature.
My avatar is a poor likeness.