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This is a road carved in the mountains, with the idea of having a train connection. It never did function, but as a train needs relatively flat terrain, it's a much more accessible option for people not used to walking. It can be done in two or three days, but come well prepared: the first two days you will not encounter any villages.
There is little information available on this trail here. So, you best off heading to a "tourist information" in Coroico and get more details. They will probably tell about where the trail starts and ends. Then consult OpenStreetMap to find the actual trail and rest of details.
Three picturesque waterfalls about 10 km away from Coroico, one way. This is a full day hike. Especially the third waterfall, La Jalancha, looks impressive.
A black Afroboliviana community with its specific music and dresses. Read on their history and pay them a visit.
River swimming.
A nice swimming pool next to a waterfall, in case it gets really hot.
Zzip the Flying Fox
A 1,500-m zipline developed by the community in 2010. It flies at speeds of up to 85 km/h. Besides this station there is another higher one across the river. Maybe you can go from this one the whole way. Check it out in case you go by with the bicycle.