Located southeast of Mexico City near San Antonio Huitepec, Oaxaca area has several areas for hiking. A good starting point for local trails is in San Antonio Huitepec.
Fly directly into Puerto Escondido from Mexico City via AeroMexico ($75).
Note: Prior to 1997, the topographic maps developed by the federal government used the NAD27 CONUS datum. Starting in 1998, the government transitioned to the ITRF92 datum (some maps show both datum), which is pretty much identical to the WGS84 datum.
Overall, San Antonio Huitepec is the 5th most popular hiking trail of all 11 hikes in Mexico.