lesser known attraction is the archeological site called the Ruins of Berlin. The most important economic activity in the canyon is ecotourism. Most of the visitors are Mexicans. Weekends are busiest with local and regional visitors to bike, swim, hike, camp and picnic. The canyon is the second most visited site in Chiapas, after Palenque. The park is visited annually by 300,000 people, about 80% of whom are from Mexico and the rest from abroad. During vacation times, the park may be visited by anywhere from 1,000 to 7,000 people per day, who either enter by car to go to the lookout points or by boat from Chiapa de Corzo. Entrance and boating fees can generate about 70,000 pesos per day for clean-up efforts. The number of visitors to the park hit a peak in 2003 with about 196,500. Commercial activity in the park is limited to those which serve tourists, sales of food and Mexican handcrafts and folk art. Tour operators are organized into cooperatives, with food and craft vendors working independently. These merchants must receive an annual permit in order to operate within the park's borders. The most important of these businesses are the boats which ferry people through the canyon along the Grijalva River. Most of these boat tours operate out of Chiapa de Corzo and run along the river to the Chicoasén Dam for a distance of about . Chiapa de Corzo has two main docks for this activity. The largest and oldest is called Cahuare, with paved areas and a restaurant; the second smaller one also has restaurants and a swimming area as well. These two docks host six tour cooperatives, with about 120 boats that can hold between ten and forty passengers each. As they take visitors from Chiapa de Corzo or Tuxtla Gutiérrez through the canyon and to the dam, they provide environmental, historical and cultural information. These are the most organized tourist activities in the park. A spate of accidents involving these boats occurred from late 2009 to early 2010, claiming the lives of six tourists and hurt sixty two others. The accidents occurred on decrepit boats, many of which were operating without permission with underage or unlicensed crew members. There were no ambulance boats and no first aid services on shore. Two of the cooperatives, Ángel Albino Corzo and Nandiume were suspended and fined for the accidents, taking about sixty boats