This is very much a stopover on your way into China from Laos. Or a quick trip for a warm weekend because the weather here gets to 30 degrees Celsius even in December.
But there's not much to this place in terms of activities. There is a nice path that goes along the side of the Mekong River that you can walk along. It goes on forever but it's a beautiful stroll. Ethnic parks are another attraction but they seem very fake. The best part is the food at the night market. Definitely try the Dai cuisine.
very quietly town with Mekong River and Thai traditional elements in China region, ideally for stay 1 night between come in Laos or Thailand
The buses are convenient. You can go and see the wild elephants. You can also see the mekong delta.