Park Marks Anniversary

The park that almost wasn't is celebrating its 40th anniversary this weekend. Biscayne National Park -- 173,000 acres, 22 miles long and 14 miles wide; extending from south of Key Biscayne to north of Key Largo; 90 percent underwater -- is America's largest marine park. But if not for the dogged efforts of a handful of local activists, it might have become an oil refinery, a deep-water port, a string of causeways with condominiums and, most recently, a final approach to a commercial airport.