ST. MARTIN -- This tiny island partitioned by the Dutch and French lies east of Puerto Rico and has some of the most spectacular beaches in the world. Orient Beach, for example, is a glorious stretch of white sand with colorful restaurants and shops on one side and the gleaming Atlantic Ocean on the other. Even dedicated water babies on a gorgeous Caribbean island need an occasional break from sunning and swimming, though. We found a lush pool of quiet at Loterie Farm on the French side, the island's only private nature preserve and a model of ecological good sense. Loterie Farm spills down the mountainside of Pic du Paradis, the island's highest point. Loterie is a seductive 150-acre hideaway, enveloped in a rain forest and dotted with signs of its roots as a centuries-old farm.