About 2km past the trailhead to Cerro Chirripó you will find the entrance to the mystical, magical Cloudbridge Nature Reserve. Covering 283 hectares on the side of Cerro Chirripó, this private reserve is an ongoing reforestation and preservation project founded by Genevieve Giddy and her late husband Ian. A network of trails traverses the property, which is easy to explore independently. Even if you don't get far past the entrance, you'll find two waterfalls, including the magnificent Catarata Pacifica.
The trails range from the gentle Sendero Catarata Pacifica, leading to the waterfalls, to the steep uphill Sendero Montaña that joins the main trail up Cerro Chirripó. Guided tours, including birdwatching, night hikes and strolls through old-growth forest, have set times and English-speaking guides, and must be booked at least a full day in advance.
Volunteer reforestation and conservation opportunities are listed on the reserve's website.