One of the most impressive arquitecture master pieces in prehispanic culture, believed to be the political, economical and urbanistic grounds of the "Tayrona" indians. I suggest you get in touch with Turismerk to do the trekking. It lasts 6 days, and it's an amazing experience. You will sleep in hammacks with protection for mosquitos, but there are also rustic houses and ecological stations with food although the agency takes care of this. You must go with qualified agencies!