Here is the documentation:
A very detailed description dated Sept 2009 can be found here:
Debriefing: A bridge is destroyed. Hike is not possible without special equipment after heavy rainfalls or during the rainy season. Some parts of the hike lead through very muddy pasture – waterproof hiking shoes are a minimal requirement. Most locals just use rubber boots.
The trail is maintained by locals and never overgrown. No machete necessary. There is a good camping site with running water (as indicated on the Bradt map). After the camping site look for a sign that says “<-- Mindo Rio Verde -->” and turn sharp left to cross the river (bridge destroyed). Bradt is wrong about the last part of the hike. From the river to Mindo it is at least 3 to 4 hours, Bradt says 2.