This cool and dense swath of jungle, officially called Mandala Wisata Wanara Wana, houses three holy temples. The sanctuary is inhabited by a band of over 600 grey-haired and greedy long-tailed Balinese macaques who are nothing like the innocent-looking doe-eyed monkeys on the brochures. Nestled in the forest is the interesting Pura Dalem Agung.
Enter the monkey forest through one of three gates: the main one at the southern end of Monkey Forest Rd; from 100m further east, near the car park; or from the southern side, on the lane from Nyuhkuning. Useful brochures about the forest, macaques and temples are available.
Note that the monkeys keep a keen eye on passing tourists in hope of handouts (or an opportunity to help themselves). Irritating recorded warnings (and signs) list all the ways monkeys can cause trouble: avoid eye contact and showing your teeth, including smiling, which is deemed a sign of aggression. Also, don't try to take bananas from the moneys or feed them. Despite this, you will be harangued to buy bananas to feed the monkeys; there is no need for this as most are already pudgy.