Las Dunas, Cuba offers 1 beach perfect for sunbathing, surfing, swimming, and more. Las Dunas, Sancti Spiritus, Cuba, is known for its proximity to the beautiful beaches of the Jardines del Rey archipelago. The best time to travel to Las Dunas, Cuba, is from December to April, with average air temperatures around 75-85°F (24-29°C) and water temperatures around 77-82°F (25-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!