Bayahibe, located just east of Casa de Campo , is reached over a hilly drive with incredible views through the Boca de Chaon Valley . The town itself is more or less a small fishing village surrounded by a few large vacation resorts. Bayahibe provides one of the entrances to the Parque Nacional del Este and Isla Soana . The park consists of limestone terraces formed a million years ago and caves containing pre-Columbian pictographs and rock carvings of the Tainos. One part of the park's coast is known for excellent diving because of its amazing coral formation diversity. The southeastern tip of the park, Calderas Bay, is where you will find saltwater lagoons with mangrove swamps and dozens of different types of birdlife. Bayahibe is also where you can hire a boat for a 45 minute ride over to Isla Saona , a 25 by 5 km sized island. This picturesque island is a popular excursion due to its beautiful white sand beach, tall coconut palms and great snorkeling, which can sometimes include peeks of manatees and bottlenose dolphins.