This archeological site, discovered after flooding from a tropical storm in 1975, is the most important on the island. The ancient ceremonial center dates from AD 300 to 700 and includes nine playing fields used for a ritual ball game that some think was similar to soccer. The fields are bordered by smooth stones, some of which are engraved with petroglyphs that researchers say might have ceremonial or astronomical significance. The most eye-catching part of the site is
the Plaza de Estrella, or Plaza of the Star, where the stones are arranged in a pattern that resembles a rising sun. Experts say it might have been used to chart the seasons. A village with several thatched huts has been reconstructed in an original setting. Be sure to visit the small museum before taking a walking tour of the site.