Please refer to the following blog which I've created specifically so as to recount my experience at the King Kong Bar in Cam Nam island, Hoi An.
The river tubing is great but be careful because even though the river is not fast or deep, it can still be dangerous.
I almost got dragged under the water by some tree roots and an Irish guy drowned a week after I was there.
Various rivers in Laos
Send your feedback or queries to been.there@guardian.co.uk
Search Been there