Birdwatching or birding is a form of wildlife observation in which the observation of birds is a recreational activity. It can be done with the naked eye, through a visual enhancement device like binoculars and telescopes, or by listening for bird sounds.
Early in the morning or late in the afternoon to beat the crowds. In general prefer the dry season from December to April.
The quetzal is more abundant from October to January but anyway you can see it all year round. Very early is best before too many people disturb the shy quetzal.