By foot and by boat, nearly a thousand volunteers took to the James River yesterday to tidy up a 70-mile stretch of shoreline. Among the items collected: 479 bags of trash; 321 bags of recyclables; 150 large or unusual items, including an 8-week-old kitten (later taken to a rescue shelter); and one “LL Cool J at Brown’s Island” sticker in pristine condition recovered in Charles City County.