The surrounding of Muang Ngoi invites for some walks. My favourite one was to the minority village of Ban Na. It is actually not a long walk, though there are quite a few interesting places along the way. It is an easy walk with no hills, though you might get wet feet when crossing a little river. No map is actually needed, but you could ask your guesthouse to be on the safe side.
To start the walk follow the main road in the village towards the south, and turn left at the end of the road – heading towards the school. Passing the school and the volleyball field it will lead you to a little path. After a short while you get to one of the first site of the walk – Muang Ngoi Kao cave. Before you enter it you have to pay an entrance fee for the whole area of 10.000 Kip. The money is used for the schools in the area.