The riverfront area can be seen on foot but it's worth getting a tuk-tuk or taxi for the trip out to the bus station. Small ferries cross the river every few minutes for about 40 baht 10,000 kip. The border crossing closes at 18:00.
If you want to look around Chiang Khong the best way is rent a bike or motorbike to visit local villages and the banks of the Mekong.
