Here's an excerpt from the book The Magic of Careyes which is basically a coffee table foto album but does have some info on the history of Careyes and the Costalegre:
The Jalisco coast had remained pristine until 1944, halfway through the twentieth century, when the state governor, General Marcelino García Barragán, introduced an initiative called Marcha hacia el mar (“March to the Sea”). García Barragán had a road built from Guadalajara to Melaque, to allow ranchers to settle that part of Jalisco. He himself claimed ownership of a beach called El Tecuán. The story of the coastal colonization he initiated would later become the subject of Agustín Yáñez’s novel La tierra pródiga (“The Prodigal Land”), written in the late 1950s, during the years that Yáñez himself served as governor of Jalisco.
In his novel, Yáñez reflected on the natural resources of the state’s coastal regions, which had been monopolized by lumber companies, land usurpers, cattle thieves and horse thieves. He was very skeptical about colonization, after seeing the destruction that the March to the Sea had caused in Melaque: “Heavy equipment kept arriving […] advancing heavily, slowly, inexorably. They tore down trees, broke down mountains, filled abysses. […] Monstrous tractors, gigantic bulldozers, colossal scrapers and enormous dump trucks. They came from the East, the North, the South, marching toward the sea.” Yáñez’s world was peopled with fascinating, crooked caciques (land owners) such as El Amarillo, the novel’s main character, based on Rodolfo Paz Vizcaíno, owner of Tenacatita ranch. Guillermo Gargollo knew him well. “The legend (of his own fabrication) has it that he was a brutal man, who had killed many people. Later, I realized it wasn’t true, but still, we were scared of him.”
On one of Gargollo’s trips to the coast, he discovered that Paz Vizcaíno had stolen their equipment in Cuixmala in order to build access roads to the beaches in Tenacatita. He built a hotel there and named it Los Ángeles Locos . Paz Vizcaíno had always been a fortunate man, but he never had the chance to stay at that hotel, and ended up losing it along with the rest of his properties, which were repossessed after he was charged with fraud involving the Banco Regional de Crédito de Occidente. The story did not end well: he was sent to prison, and then to a mental hospital, or so they say.