Most people come to San Juan dreaming of walking the colorful streets of Old San Juan, relaxing on golden beaches, or enjoying the city's famous nightlife. Few realize that just minutes away lies one of Puerto Rico's most peaceful and fascinating natural treasures. As the sun begins to set, the pace of the city changes. The warm Caribbean breeze softens, the skyline starts reflecting across calm waters, and birds make their final flights of the day. Then, almost unexpectedly,