Just before leaving the terminal building for your flight, you are asked for 10 USD per head.
Most people use this airport to go to Siem Reap, to see the Angkor complex.
Fondest memory: The waterfalls, quite far from the town, but an enjoyable journey, especially if travelling by a private air-conditioned luxury van.
Favorite thing: There are at least two BCEL ATMs in town, both on Route 13. One opposite the Lao Development Bank, the other one further east at the sports stadium. Worked fine with my ordinary Maestro/Cirrus card.