It is also possible to hike down the North Yungas Road to Cocoico within a day. It is 30 km, but downhill all the time. Or hike up, if you feel like it (2000 m in altitude!), and take any bus from the top end back to La Paz.
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.