Sendero Río Borosa is the park's most well-known route through a spectacular gorge hewn out by the Borosa river, passing waterfalls on the way upstream to two mountain lakes. It starts at the Torre de Vinagre visitors' centre and takes around seven hours to do the 19km round trip.
From the centre follow the signs to the Central Eléctrica, the electricity station, cross the river and park just before the trout farm (piscifactoría). Walk past the fish farm and you'll see the signpost marking the beginning of the walk. Go over the bridge to reach the riverside path, which crosses the river at several points via bridges. Where the path forks, take the right turn signposted Cerrada de Elías, which leads into a narrow gorge (cerrada) and includes a boardwalk section above the river.
Then you come to the Central Eléctrica and a bit further along, the path goes through a few tunnels leading to two small reservoirs, the Laguna de Aguas Negras and the Laguna de Valdeazores.