Vang Vieng’s main attraction has long been its dramatic setting. The limestone cliffs that provide the town with its stunning backdrop are honey combed with unexplored tunnels and caverns – a true spelunker’s heaven. Meanwhile, the Nam Song (Nam Xong), the river that gracefully borders the town at the foot of these cliffs, plays host to kayakers and travellers floating along on tractor inner tubes – a pastime so thoroughly enjoyable and popular that it has become one of the rites of passage of the Indochina backpacking circuit. Vang Vieng has evolved into Laos’s number one adventure destination, with kayaking, rafting, caving, trail- and mountain-biking and world-class rock climbing all available. These activities tend to be more popular than the sights, which are mainly monasteries dating from the 16th and 17th centuries.
Read more: http://www.lonelyplanet.com/laos/northern-laos/vang-vieng/things-to-do/vang-vieng-s-adrenaline-activities#ixzz3ra93gjuh