Situated 30kms south of Luang Prabang, Kuang Si Waterfallsmakes for an excellent daytrip. Accessible by taxi or bicycle, the 650 feet high waterfall is at its most picturesque during the wet season however it can be visited year-round. Children are not recommended to climb to the top of the waterfall, but they can swim in the various pools at the bottom. Walkways and a few food vendors are present, making this a good place for a picnic. On the road out to Kuang Si Waterfall, there are a number of villages housing traditional hydro-rice mills. Most people like it in Laos tour.
An unusual alternative is to hire a boat and ride down the Mekong River before catching another boat for a short hop across to the falls. You will also need to pay an additional admission fee to one of the locals at the falls usually $2.00US per person. This goes towards keeping the bridges and walkways in good working order.
After 4:00 pm, it's worth a stroll around some of the local villages, such as the villages of the Kamu and H'mong (before this time they are empty as they are all out working in the paddy fields). If you do not feel up to the walk, you can always stay in the car. En route back to Luang Prabang, you may find that you have timed it perfectly to watch the sunset from Pha Bath Tai, a beautiful old temple.