Story Ideas full details St. Maarten Carnival Carnival in St. Maarten, the islands' wildest celebration, will be held April 15- May 1, 2010. Sonesta Great Bay Beach Resort & Casino sits right in the heart of the action in Philipsburg! full details Dive In! Go deep at Great Bay! Sonesta Great Bay Beach Resort & Casino’s in-house Adventure Dive Center & Water Sports department and its PADI certified instructors patiently guide guests to scuba in St. Maarten. full details Shopping - Duty Free As the only completely duty-free island in the Caribbean, St. Maarten offers some of the region's best shopping.