Hiking is done primarily along the Corredor Biológico Ajusco Chichinautzin in the mountainous regions of Huitzilac, Tepoztlan, and Tlayacapan. Many waterparks allow camping, and both the YMCA and the Scouts of Mexico operate large campgrounds in Tepoztlan. Rock climbing and rappel are popular at the Scout camp in Meztitla and elsewhere, such as Lagunas de Zempoala National Park. There isn't really much mountain climbing in Morelos, and it is illegal to climb Popocatepetl since the volcano is active.