This temple located in a holy mountain is very famous for its particular shape and the fact that it is located in the Pasak mounts.
It is possible to get there in scooter. It is located 1 hour away from Paksé.
The good alternative is that Paksé is located on the boarder of the Mekong river and it is possible to take a boat in order to reach Champassak and go to the Wat Phou.
I will take the most convenient option knowing that it takes half a day of transport and visit if I go in scooter.
The entrance costs 50 000kips and 5000 kips for parking which is around 5.5 euros.