Interesting day tours combining hiking in the jungle – you'll need to be relatively fit – with a visit to Phong Nha's Wildlife Rescue and Rehabilitation Centre, which rehabilitates rescued animals (mainly macaques from nearby regions, but also snakes and birds). Prices include a barbecue lunch, and there's an opportunity to cool off at the end of the day in a natural swimming hole. A two-day/one-night option (3,200,000d) camping overnight in the Weapon Cave is also available.