Palenque is in Chiapas, Mexico famous for the ruins of a Mayan city dating from about 600 AD to 800 AD. Set amidst thick trees, Palenque still evokes some of the wonder that the early Spanish visitors must have felt when they first came across the ruins.
The closest airport is Villahermosa, about two hours away by road. Tuxtla Gutierrez, the airport for San Cristobal de las Casas is five to six hours away by bus. Both airports are well serviced with flights from Mexico City and other points in Mexico.
The easiest way to get to Palenque is by bus. There are many buses daily from San Cristobal de las Casas (five hours), Tuxtla Gutierrez (six hours), Villahermosa (2.5 hours), Merida (10 hours), Campeche (5 hours), Cancun (13 hours). Daily (one or two buses) also ply from Mexico City (16 hours), Oaxaca (15 hours), Playa del Carmen (12 hours), and Tulum (12 hours).
It is also possible to get to Palenque from Flores in Guatemala by bus (6h, leaving Flores daily at 5am, USD 35.00).
The ruins are about 6 km from the town of Palenque and minibuses run between the town and ruins every 10 to 15 minutes during the day. Combis - shared taxis - are also available. Just wait at the park gate at El Panchan. A colectivo will pick you up.
You can get some Maya-style artwork from outdoor vendors who set up unobtrusively at the ruins.
Sleeping accomodation can be found either in the city of Palenque, or just outside the limits on the road to the national park.
Don Muchos is a great restaurant at El Panchan as well. Great stone-oven pizza's and live music. The stone-oven pizza's cost 60 pesos and are very good.