These establishments often offer tours, workshops and other services such as accommodations, food service, recreational activities and more. The route has the only museum dedicated to cacao and chocolate. It also has a number of Chontal communities such Cupilco, the Comalcalco arqueological zone and Paraíso with its beaches. Most oil drilling occurs around the communities of La Venta, Cárdenas, Paraíso and Cunduacán . The economic boom due to oil has made the cities of Cárdenas and Comalcalco the second and third most important in the state. In the area which is now Chontalpa, various ethnicities such as the Chontal Maya, Zoques and Nahuas inhabited before the arrival of the Spanish. The Chontal Maya were found around the rivers in the flatlands, with the Zoques found in the highland area. The Nahuas were dispersed in various areas. Because of the wetlands created by the flow of the rivers, much of this area was inaccessible for hundreds of years. However, during the colonial period various haciendas were established in the region to produce cacao, livestock and other products. The indigenous population diminished greatly and almost disappeared with estimates of the loss as high as ninety percent due to disease and abuse at the hands of the Spanish. While the area, nor the rest of the state, developed economically as other areas of New Spain, it was still considered important as a transit point and for its production of cacao. Despite Independence, little changed in the area economically until the latter 20th century, mostly due to the discovery of petroleum. Today, most in the region are not employed in agriculture. Oil drilling began in the 1950s, with the production initially for domestic use. Large scale drilling began in the 1970s for foreign income, controlled by the state oil company PEMEX. It became the major income producer in the 1970s. It also signaled the beginning of ecological damage in the region, although drilling was not the only factor. Environmental damage since this time has affected fishing, agriculture and livestock, leading to tensions between the local population and PEMEX, including legal actions, protests and event the blocking of oil facilities. Another major factor in the economic development and environmental degradation of the region was the implementation of the Chontalpa Plan. This was a plan introduced by the federal government to develop the hydroelectric potential of the area's rivers, and convert wetlands into those suitable for agricultural production.