The site has a small museum and as in almost all parts of Guatemala, there are handicrafts stalls. The fee entrance is 23 quetzales for tourists (4$).
Bush visited the place in march of 2007, and after that visit mayan priests conducted purifying rites to cleanse the place of bad spirits brought by the president (funny).
The place is very popular for picnics but if you´re lucky it´s possible to mayan rituals, where the indians burn copal, give fruits, grains and alcohol to their gods, and even sacrified small animals like chickens.
You can reach Tecpan by bus, there are several buses from Antigua, Chimaltenango or the city, and then a nice walk through pine tree forests (5 kms) from Tecpan. Some tours to Atiltlan lake or Chichicastenango market make a short stop at the site.
Miscellaneous: As in almost all parts of the western highlands the climate can change from hot during the day to chilly at night, so bring warm clothes and a rain coat in the winter time (heavy rains) from may to september.