The concept is that you get more of a total body workout. than just by running or walking in the park by completing the par course. It has various outdoor equipment or obstacles to climb over or do some exercises on while running from station to station.
With such lush greenery all around, I think I would be distracted and would want to look for animals rather than do exercises. The par course is located along the road that connects Tamarindo with Playa Langosta.