For me, Kuang Si waterfalls is the highlight of my Laos trips.
We took a roundtrip tuk-tuk ride cost around 17USD (the driver waited for us at the falls to bring you back to town). So reminder for all you guys out there, pay the driver when u back in the town.
The amazing entrance of Kuang Si Falls. The entrance fee is 20,000kips. 
A single large cascade tumbles from the jungle feeding a series of falls and pools that make perfect swimming holes. Laos may be a landlocked nation without beaches but Kuang Si’s cool turquoise waters make up for it.
And beside I get to swim in this beautiful water as well as, guess what,wearing a santa hat!!
The waterfall is absolutely breathtaking and the tranquil atmosphere. It was a great day trip out from Luang Prabang.
~Joie de vivre~ 