Subject: Mexico in august
Simona, I'd recommend using buses. The Mexican bus system is very extensive with various classes of travel. Costs are low and very comfortable travel can be obtained at reasonable prices. Rental cars on the other hand are much more expensive than in Europe or the U.S.

Here are two links about bus travel in Mexico: http://www.mexconnect.com/mex_/travel/rferguson/rfbus.html http://www.magic-bus.com/

Here is a link to ADO, one of several bus lines that service the Yucatan: http://www.adogl.com.mx/mappeni.html

Here is a link to Cristobal Colon, a bus line that services Chiapas: http://www.cristobalcolon.com.mx/

Here is a link to Linea Uno, a bus line that services southern Mexico: http://www.uno.com.mx/ John Rule San Diego, CA