Arvi Park is in northeastern Medellin at 3,000 feet above the valley floor. It is easily accessible via the Metrocable which is integrated into the city's Metro system. The park is a bit of a confusing place as to what you can actually do and where it is safe to walk around. It seemed as if a guide is required to leave the roads and go into the forest but I'm not sure if that is due to preventing abuse of the forest or security.

I ended up doing a 3 hour guided walking tour with about 20 people. It initially followed a small road up a gradual incline. It eventually changed to a stone walking path which led up a wetlands area as well as a lake, both of which had a decent quantity of water. A short hike from there led to a nice viewpoint above the city of Medellin. Overall, it was a nice hike and interesting to see various ecosystems such as the forest and the wetlands.

I'm guessing that the areas that are further away from the Metrocable station aren't entirely safe. During the latter part of the walk, once we entered the stone path area, we were shadowed by police on horseback. While its very common in Colombia to see the police as well as the Army patrolling tourist, having them go along with us is new to me. That said, I did see people walking around in small groups - its always hard as an outsider to judge.