Costa Rica Sky Adventures Arenal Sky Trek Zipline is a thrilling zip line circuit that’s located in Arenal-La Fortuna Costa Rica. The tour starts with guests riding an open-air gondola to an observation area, where they will take in awe-inspiring views. Guests will then begin zip lining on a track stretching across canyons and in between treetops, ultimately returning to the starting point at the main building. The trek consists of 7 zip lines which take approximately 2.5 hours to complete. The longest cable is 760 metres and the highest cable is 200 metres.