What types of people seem to freequent the green pool?

"There is a path through the willows and among the sycamores, a path beaten

hard by boys coming down from the ranches to swim in the deep pool, and

beaten hard by tramps who come wearily down from the highway in the evening to jungle-up near water. In front of the low horizontal limb of a giant sycamore there is an ash pile made by many fires; the limb is worn smooth by men who have sat on it."