Costa Allegre - Pacific Coast between Barra de Navidad & Puerto Vallarta.
Spanish is the main language spoken although English speakers can be found with little effort. Many locals understand a few English words but can not converse in English with you. If you do not speak Spanish, be patient as the locals will make every effort to understand you.
Regional bus system runs 7 days per week & is cheap (peso's only) & realiable. Most busses stop frequently. Most bus drivers speak only Spanish but will understand if you know the name of the city you want to stop. Most first class busses are air conditioned.
Look for blue bus signs on major roads. The drivers will stop for you.