Closer to Muang Noi than Ban Na village is the more strenuous 1/2 day trip up the hill next to Muang Ngoi. The hike is more difficult though you get rewarded with some great views over the surrounding area.
To start the walk pass the temple heading north, crossing a stream and follow the path through the forest. While the shade protects you from the sun it is still quite humid. After 10-15 minutes you arrive at a little hut with a few benches (perfect for a little rest when coming back). Here you find a path up the hill. When I say path it is a combination of a little path, some wooden ladders and to top it some bamboo rafts to connect rocks with a gap between them. The path really is not the best – I would rather choose the word interesting.