Heartquest, I don't know WHY they'd carve a figure of a Humpback Whale, but there's one in your first photo. (outlined in red):
with an elephant, of all things, on it's back.........kinda.............outlined in yellow. It MIGHT be a elephant seal because it's leg / foot kinda looks like a flipper. LOL There are several pecked holes in the end of it's trunk / snout. They might have some needed info for your trail. ( values for distance, depth, etc) I've circled the end in white. Those areas I've crudely circled in white have the appearance of holding signs and symbols... If you can spare the water, try spilling some on those areas to see if it would help bring out the shapes better.
EDIT: See if the foot / flipper has a detailed number of toes (toenails). These, too, may have some value. Ask one of the experienced trail hunters for confirmation on that.........the becked holes in the snout end and the toenails. Dsty is the go-to person for info on drill holes and pecked holes.