Located in the northwestern corner of the valley, La Piedra Pintada is a huge boulder adorned with pre-Columbian carvings. Locals often fill in the grooves of the petroglyphs with chalk to facilitate their viewing. However, the meaning of the petroglyphs isn’t clear; some think it is an early map of the area. That doesn’t prevent children from giving their interpretation of the petroglyphs for US$2 (in Spanish only). The trail to the rock takes just a few minutes from the main road.
La Piedra Pintada can be reached by a white bus with ‘Pintada’ above the windshield. It passes along Av Central every 30 minutes or so from 6am to 6pm (US$0.25 one way).