Arroyo Barril, Dominican Republic offers 1 beach perfect for sunbathing, surfing, swimming, and more. Arroyo Barril, Samana, Dominican Republic, is known for its proximity to Los Haitises National Park and the annual humpback whale watching in Samana Bay. The best time to travel to Arroyo Barril, Dominican Republic, is from December to April, with average air temperatures around 77-86°F (25-30°C) and water temperatures about 79-82°F (26-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!