Mt Abuna Yosef is within hiking distance from Lalibela town. It and the surrounding conservation areas are only reachable on foot and can be done in a multiday hike along the escarpment. The route can also include some of the churches out of Lalibela town. If you are feeling fit and adventurous, go hike. It's probably best to spend at least one night in the mountains. 2-3 nights is plenty.
A modern, airy building (opened by the United Kingdom's Princess Anne on 9 Oct 2002!) with a small stock of books in Amharic and an even smaller stock (many of them textbooks) in English.
Although the women who runs this stayed in France for several years she never learned to cook a crêpe properly. However, she is probably just the person to teach you how to make injera with a fine and tasty wat over an open fire.