The dry season, between June and November, is the best time to visit Manu National Park in Peru, which is also celebrating its 40th anniversary this year! It is sometimes impossible to access the park during the rainiest time of the year, between January and April. Since it is illegal to tour the park without a licensed guide, its best to arrange an organized tour beforehand, in Cusco or with international tour operators online.
This huge national preserve in the Amazon Basin spans nearly 20,000 sq km (12,427 sq mi) and is home to a huge array of tropical wildlife. Due to its progressive emphasis on preservation, Manu was declared a Biosphere Reserve in 1997 and a World Natural Heritage Site in 1987 by Unesco.
The park has been very successful in maintaining its virgin wildlife, mainly because of its inaccessibility. Due to its remote location, it has been untapped by trappers, loggers, hunters, and so on.
You can camp and hike near the lake Cocha Salvador. If you are patient, you are almost guaranteed to see exotic wildlife. During a weeklong trip, you could likely see lots of different birds, monkeys, and other jungle mammals.