I hear this is the place where the party is (if you like that):
"Vang Vieng has become a backpacker-oriented town, with the main street featuring guest houses, bars, restaurants, internet cafes, and tour agencies. Attractions of the town include inner tubing and kayaking on the Nam Song River, which, until 2012, was lined with bars selling Beer Lao and Lao-Lao, and equipped with rope swings, zip lines, swimming and diving into blue lagoon, and large decks for socializing."