Chichén Itzá is the largest of the archaeological cities of the pre-Columbian Maya civilization in the Yucatán Peninsula of Mexico. It is one of Mexico's most visited tourist destinations. It was granted World Heritage Site status in 1988 by UNESCO World Heritage Site and was selected as one of the New Seven Wonders of the World.
While the ruins are amazing, you will probably be disappointed by the large number of vendors allowed in the park. The vendors certainly don't "ruin" the experience, but they do diminish it. They are ubiquitous, often loud, and sometimes aggressive. This is in contrast to other Mayan historical sites where vendors are prohibited (e.g. Tikal in Guatemala).
Many tourists visit Chichen Itza as a day trip, especially from Cancún, more than 160 km (100 miles) away. This archaeological site is also an hour and a half away from Mérida, the capital of Yucatan. The Maya communities near Chichen Itza have developed many wonderful sites for travellers to rejoice in the Maya Cultural heritage.