The route 201, 2154, 4014, 2399, 2115, 2399, 203, 2294, 2195, 4007, 2013, 203, 2399, 2115, 2399, 4014, 2154, 201
Total distance 248 km
I left Chiang Khan heading south on the 201 then took a right onto the 2154 after about 4 km, at the junction with the 4014 it was a left and then a right onto the brilliant 2399.