Luang Prabang is a city in Laos.
You have to get out of the road 13 that heads once from North to South through Laos. This is possible by walking, by tuk-tuk (max. of 50 000 kip for however many) or motorbike Taxi. From the main road inside the city it is also possible to find someone who can take you there (2km sign).
A good spot was a few meters from the intersection to the little waterfall (the one with the Elephant camp). Don't be discouraged by the size of the road, the lack of vehicles (approx. one every 2 minutes for me at noon) and the lack of possibilities to communicate with the locals. It's very possible to make it to Vang Vieng quicker than by bus.