Until recently tubing was a controversial activity in Laos, as it included not only an extreme descent down the river, but also lots of drinking, and even drugs. Today due to government action tubing is now strictly a water activity with maybe some beers in the nearby bars.
In order to start tubing one should find a rental office in Vang Vieng and then head to the Nam Song river. A tuk tuk driver can take you with your tube to the best starting point near the Vang Vieng Organic Farm. This is where you drop your tube on the water and then begin your crazy trip down the river. The trip usually takes from two to three hours, depending on the season. Of course, no one can assure complete safety for tubers, as during the dry season and low water you can scratch your back on the bottom, and during the rainy season and high water you may fall off the tube on steep turns or huge slides.
Overall, tubing is a great way to enjoy beautiful landscapes while lying on the tube or chilling on the banks.