Piedra Blanca  is a small community in Bolivar Province, Ecuador. The community has traditionally lived by agricultural farming, fish farming and logging. An ecotourism project now provides an alternative to logging as the locals accompany tourists to the forest, local cultural sites of interest, other local villages and on rafting expeditions.
It's a 60 - 90 minute uphill walk, or ~$10 ride if you can find someone to drive you, from San Luis de Pambil.
Toucans, hummingbirds, butterflies, waterfalls, etc.
Local reforestation charity CRACYP 
Trek in the forest or up to the white rock (piedra blanca) with a local guide. Birdwatching.
Head downhill on foot (~60 minutes) or on a hired horse to San Luis de Pambil. Stay there for a few days - Eco-Friendly Farmstays  - then take a bus out to Quito (~6 hours), Guaranda (~5 hours), Santo Domingo de los Colorados (~3 hours) or Guayaquil (3-4 hours).