Thank you both.
Tony - next time I go out I'll try finding a good shot of the boards/names. I also need to go out in the morning so I can get some light down the bluff... The rock face has also been carved by generations of people. Actually, there was enough light - but deep in the woods, on an east-facing wall, in late afternoon, it looked way too dark and I was shocked when the two shots I took there turned out (I was curious so I took the photos anyway).
Stogie - Yes, it was shot in late afternoon in one of the few places in the area where the sun isn't filtered through trees, so the lighting was harsh. But, the problem with lighting is probably mostly mine - its a little over-exposed, because I don't have a light meter on my camera (its a Nikkormat FTn... there IS a light meter, but I can't get the battery compartment open to replace the battery I took out).