Bamboo raft trips on the Pai River are one of the signature activities of Mae Hong Son, arranged by guesthouses and tour operators in town. The standard trip launches at Ban Huay Deua, 8 km outside town, and drifts downriver through jungle and past hill tribe villages. The river is calm in the dry season — this is floating, not whitewater — and the journey gives access to stretches of riverbank that are impossible to reach by road.
Full-day trips can be extended with stops at Karen or Shan villages along the way. The trip typically ends at a point where a truck returns passengers to town. Best done in the cooler months (November–February) when the water is low and the jungle most pleasant.