Cañón del Sumidero
This is a long canyon, with steep sides up to 1km high. There is a river running the length of it, upon which boat tours are run.
An all inclusive tour from San Cristobal de las Casas costs 200 pesos. You can also take a colectivo towards Tuxtla Gutiérrez (40 pesos) and ask the driver to drop you near Chiapa de Corzo. Cross the road and take another colectivo (5 pesos) to the 'embarcadero' where you buy a boat ticket for 160 pesos. The boatride takes about two hours, so bring drinkingwater, a hat and sunscreen.
160 pesos for a boatride.
Crocodiles and birds in beautiful nature.