Motorbike taxis and sǎamláw do short trips around town for 20B. They gather opposite the bus terminal.
A good way to see the Chiang Saen–Mae Sai area is on two wheels. Mountain bikes (per day 50B) and motorcycles (per day 200B) can be rented at Gin’s Guest House (0 5365 0847/1023; 71 Mu 8). If you are heading southwards to Chiang Khong, Rte 1129 along the river is the road to take.