Walkers are spoilt for choice with 516km of marked trails, most of them substantial five-plus hour treks. Excellent hikes begin from Râușor, northwest of the park, to Cabana Pietrele and deeper into the park. Cabana Gura Zlata is another key entry point. Retezat Park Administration Centre is a superb first port of call for hikers.
Worthy trails include the following. Approximate durations are one-way, and vary according to fitness levels.
Râușor to Lake Ştevia (three to four hours) This medium-difficulty trail follows red markings past spruce forests to a glacial lake.
Cabana Codrin to Poiana Pelegii (5½ hours) Start at Cârnic north of the park towards Cabana Pietrele along the blue trail, peaking at Lake Bucura (total elevation difference is more than 1200m) before a descent to Poiana Pelegii.
Cabana Pietrele to Lake Bucura (6½ hours) The challenging yellow trail hoists hikers to 2041m-altitude Bucura, the largest glacial lake in the Retezat Mountains. The lake is also reachable by seven-hour hike from Cabana Gura Zlata.