fees/permits
The entrance fee is 35,000 COP for foreigners, 13,000 COP for Colombian citizens and 7,000 COP for students you must bring student ID AND copy of passport to prove you are 25 or under and children from the age of 5 to 12. Bags and personal belongings are checked at the park entrances.
Take lots of food and water with you, it's incredibly expensive inside the park compared to Colombian standards. For example a can of coke costs 3,000 COP, a beer 3,000 COP and a 5 liter bottle is 7,000 COP, although prices do vary from site to site Cabo is a bit cheaper, Arecifes a bit more expensive since many more people stay there.