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The North Yungas Road is a popular destination for mountain biking tours from La Paz. There are many providers in La Paz that offer the tour. Unfortunately, they have kind of a quasi monopole, because most people will only contact one company and go with them. Hence, their prices are way too high.
Generally, bicycles and people are brought from La Paz into the region. You will ride a bike in the new paved road about a half hour, then enter the most dangerous road in the world, North Yungas Road (a.k.a. Death Road). All together 60 km (3-6 hr), and at the end you are having buffet lunch, showers and a swimming pool in Yolosa. You can of course also stay in the region, but general the tour providers are a little reluctant to take too much luggage.
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.