Cerro Castillo Park is part of the Patagonia Parks Network project, being a protected area of 180 thousand hectares, the most popular trail is the Las Horquetas circuit, which is made up of 53.5 km of travel in the heart of Patagonia. For more details I invite you to review my travel blog OctaviaViajando.com
If you are a lover of hiking, I recommend you do the Horquetas trek, 5 days and 4 nights.