Nam Nern Night Safari is a 24-hour, boat-based tour in the Nam Et/Phou Louey National Park. Highlights of the trip include a night-time boat ride 'spotlighting' for tigers, gaurs and white-cheeked gibbons. Seeing a tiger is very unlikely but there's hope of spotting sambar and barking deer. Sleeping is at an ecolodge overlooking the Nam Nern. The price includes a fireside dinner.
Book through the Nam Et/Phou Louey National Park office in Vieng Thong.