Huge Mekong River gives many transport and excursion possibilities. You can even sail by this river from Vientiane to Luang Prabang avoiding mountain roads. But the boat voyage takes 2 days with overnight ashore.
I took a standard excursion from Luang Prabang to the Pak Ou caves – it is only 1,5 hour each way… Many hotels and travel agenciec offer this tour for just 4 USD plus 10000 kip entry fee. On the route the boat stops at the little village where the local people produce lao-lao – rice wine tasting like sake…
Sail to Pak Ou gives you opportunity to enjoy the river landscape. In the caves there is more then 2000 images of Lord Buddha…