Cayo Arena, Dominican Republic offers 1 beach perfect for sunbathing, surfing, swimming, and more. Monte Cristi is known for Cayo Arena, a stunning sandbar surrounded by crystal-clear waters ideal for snorkeling and relaxation. The best time to travel to Cayo Arena, Dominican Republic, is from December to April, with average air temperatures around 77-86°F (25-30°C) and water temperatures around 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!