Taking in mist-covered ruins: Much of the enormous complex of Palenque has yet to be excavated, so you can see how thoroughly the jungle claimed them.
A pleasant stay in a little-visited colonial town: Lovely colonial architecture, the excellent Museo Na Bolom, and nearby San Juan Chamula make San Cristóbal de las Casas an important stop.
A Heart of Darkness-like boat trip: Go by water up the Río Usumacinta to see the Maya city of Yaxchilán surrounded by magnificent 100-year-old ceiba trees.
The chance to see a breathtaking canyon: Cliffs rise to 1,067 km (3,500 feet) at their highest point in the Cañón del Sumidero.
Convening with history: Wander through the trees around massive stone heads left behind by the Olmecs at the Parque-Museo La Venta.