Soledad de Maciel, also known as La Chole, is a large archeological site that is slowly being excavated and explored. It is about a 30 minute drive from Play Blanca and Barra de Potosi. The website is http://www.soledaddemaciel.com/ .
A bonus to the trip is a visit to the nearby village of La Chole where several locals make handmade cigars from locally grown tobacco.
The following description is from Wikipedia: La Soledad de Maciel is a Mesoamerican archeological site located on the Costa Grande of the Mexican state of Guerrero, near Zihuatanejo. While pieces had been found at the site earlier, including the King of La Chole stele and Mesoamerican ball court rings, formal excavations were only recently begun. The site had been occupied for over 3,000 years and by three cultures, with contact with other Mesoamerican cultures such as the Teotihuacan and Olmec. Explored areas include what may be the largest Mesoamerican ball court, a one-hectare pyramidal base and a hill with petroglyphs and a probably sacrifice stone.
According to residents, pieces had been found in the area since the 1930s, including some of the most important but formal excavations were begun only in the very late 2000s, when authorities began to acquire lands. One of these pieces is a stele discovered in 1944 called the King of La Chole, who was a figure that venerated. Today, this piece is at the local church. The feet of the stele is in a private home. The rings of the ball court were taken to the city of Petatlán, along with a circular stone representing the goddess of the Earth, Tlaltecutli. There are plans to bring the rings and goddess back to the site, but the stele will remain at the church.
The site is located in the municipality of Petatlán, in the small village of La Soledad de Maciel. This village is located four km south of Highway 200 at the end of a dirt road. The village has a population of about 400 inhabitants with just under eighty houses. The residents subsist on agriculture, growing corn, beans, vegetables and coconuts, supplemented by some cattle and fishing along the local shore. The area is also known for the cultivation of tobacco and the making of handcrafted cigars. The excavation of the site and construction of a museum was built from 2007 to 2010 at a cost of 12 million pesos, not only to study and preserve the site but also to provide tourist attraction to an area with limited economic possibilities. According to the Instituto Nacional de Antropología e Historia the ruins could be as important as Teotihuacan or Chichén Itza as they span from the pre Classic to post Classic periods in Mesoamerican chronology. It is the largest ceremonial center and largest archeological site in the state. The site coincides with the ancient city of Cihuatlán, which flourished between 200 and 800 C.E. It was the largest population center between Acapulco and Zacatula at its height. Pieces of ornamental work in made with shells and copper indicate that this was begun here earlier than in Michoacán .