Medellín is a beautiful city. Seeing it from above... wow! And it’s also really cheap. What’s not to love.
To get there, just buy a normal metro ticket, then go to the Acevedo metro station. You can take directly from there the K line. If you wanna continue after that at the end of the line to the other line (the L one, which goes to the Parque Arvi), you need to buy another ticket. Do it, because the first few minutes you will get great views of the city.
If you only have a few days in Medellin, it’s totally a must.