Wildlife-watchers should keep quiet and always be on the alert. Animal survival depends on their seeing you before you see them. Occasional spectacular offshore sights, such as whales, porpoises, and manta rays, or an onshore giant constrictor, beached squid, crocodile (caimán), or even jaguar looking for turtle eggs, are the reward of those prepared to recognize them. Don’t forget your binoculars and your Bird-Finding Guide to Mexico.
Although wildlife-watching is likely to be rewarding for the prepared everywhere in the Puerto Vallarta  region, the lush mangrove lagoons around San Blas  are special. For even casual nature enthusiasts, the La Tovara jungle-river trip  is a must.