Why does Billy hurry to the deserted campground?

Billy hurried to the deserted campground to find the fishermen's forgotten treasures.

I hurried to the campground. It was always a pleasure to prowl where fishermen had camped. I usually could find things: a fish line, or a forgotten fish pole. On one occasion, I found a beautiful knife stuck in the bark of a sycamore tree, forgotten by a careless
fisherman. But on that day, I found the greatest of treasures, a sportsman’s magazine, discarded by the campers. It was a real treasure for a country boy.