WAIANAE, Hawaii — Bert Bustamante and his family look as if they are enjoying a vacation at the beach, with kids swimming in the ocean, fish frying on the grill and radio music floating in the air. A closer look, though, reveals the truth: Life on the beach is about all Bustamante and his neighbors have. They are homeless in paradise. Just up the coast from a major luxury resort, at least 725 homeless people _ by one community group's count _ are living on a 16-mile stretch of Oahu's western shore, a pristine beach where oceanfront lots would cost...