coastlines of Mexico harbor many stretches of beaches that are frequented by sun bathers and other visitors. On the Yucatán peninsula, one of the most popular beach destinations is the resort town of Cancún, especially among university students during spring break. Just offshore is the beach island of Isla Mujeres, and to the east is the Isla Holbox. To the south of Cancun is the coastal strip called Riviera Maya which includes the beach town of Playa del Carmen and the ecological parks of Xcaret and Xel-Há. A day trip to the south of Cancún is the historic port of Tulum. In addition to its beaches, the town of Tulum is notable for its cliff-side Mayan ruins. On the Pacific coast is the notable tourist destination of Acapulco. Once the destination for the rich and famous, the beaches have become crowded and the shores are now home to many multi-story hotels and vendors. Acapulco is home to renowned cliff divers: trained divers who leap from the side of a vertical cliff into the surf below. Along the coast to the south of Acapulco are the surfing beaches of Puerto Escondido, the snorkeling, harbor beach of Puerto Ángel, and the naturist beaches of Zipolite. To the north of Acapulco is the resort town of Ixtapa and the neighboring fishing town of Zihuatanejo. Further to the north are the wild and rugged surfing beaches of the Michoacán coast. Along the central and north Pacific coast, the biggest draws are beaches of Mazatlán city and the resort town of Puerto Vallarta. Less frequented is the sheltered cove of Bahía de Navidad, the beach towns of Bahía Kino, and the black sands of Cuyutlán. San Carlos, home of the Playa los Algodones (Cotton Beach), is a winter draw, especially for retirees. At the southern tip of the Baja California peninsula is the resort town of Cabo San Lucas, a town noted for its beaches and marlin fishing. Further north along the Gulf of California is the Bahía de La Concepción, another beach town known for its sports fishing. Closer to the United States border is the weekend draw of San Felipe, Baja California. Archeological sites Teotihuacan Tula Monte Albán Chichen-Itzá Uxmal Palenque Tulum Calakmul and Edzná Xochicalco Malinalco El Tajín Cholula Casas Grandes Chalcatzingo The central and southern parts of Mexico was where a number of pre-Hispanic civilizations developed, the most prominent being the