Belen market is an experience but not to be taken lightly by the tourist. It is extremely busy and offers all sorts of fruits and plants, but it is very dirty and pick pockets are checking you. Better pay a local guide 50 soles or 20 $ to take you round. Do not wear jewelry, expensive camera bags or expensive sunglasses. They specially target mobile phones and wallets. Apart from that, the whole area offers cheap merchandize and interesting smells colors and photo opportunities, but again, secure your camera. At the back is the meat and fish section, patrolled by 100's of small vultures. Below the rise is the barrio of Belen, which floods every year as the rivers rise annually. The porest of the poor are there and the drug trade flourishes too. Inside the markets is the famous "Pasaje Paquito", the witches' market. Anything you need for Hogwarts you can get there. Just be careful of friendly stall keepers who want to shake your hand, and stick a curse on you! From personal experience! Enjoy.