VIEQUES, Puerto Rico (AP) — Another long holiday weekend is starting, and tourists are flocking by ferry and small plane to Vieques, a tiny island off the coast of Puerto Rico that's famed for bright turquoise waters, lush mangrove forests and picturesque free-roaming horses. Richard LaDez, director of security for The Humane Society of the United States, picks up a contraceptive dart that fell from the horse's rump and declares, "We're good!" He gives a thumb's up to a team waging an unusual fight to control a tourist attraction that's become something close to a plague on the island, best known as the site of a former U.S.