Isla del Viejo Soyaltepec, Mexico offers 1 beach perfect for sunbathing, surfing, swimming, and more. Isla del Viejo Soyaltepec is known for its serene beaches and vibrant local culture, making it a unique travel destination in Oaxaca, Mexico. The best time to travel to Isla del Viejo Soyaltepec, Mexico, is between November and April, with average air temperatures around 75°F (24°C) and water temperatures near 77°F (25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!