Accessible by the fantastic new Cable Arví Metrocable (Linea L) from the Santo Domingo interchange (COP$4600 one way, 15 minutes), Parque Arví is a big chunk of mountain wilderness in Santa Elena that makes a great escape from the city. Inside the boundaries of the 17.61-sq-km reserve are hiking trails, canopy lines, lakes and a mariposario (butterfly enclosure).
Free guided walks leave every hour from 10am to 3pm from the tourist information point. The cable car is closed for maintenance on Mondays.
Attractions are spread out so it's best to arrive early.