A woman sunbathing in New York City’s famed Central Park was attacked Monday by a man who exposed himself and tried to sexually assault her, police said. The 21-year-old woman was alone in an area known as the Great Hill when the man approached her around 1:30 p.m., New York Police Department Chief of Patrol John Chell said. She screamed and ran off when she saw the man exposing himself but he chased her down and tackled her from behind, Chell told reporters during a news conference in the park. The man tried to “get on top of her” but she “valiantly fought him off” and he ran away southbound …