David, the ride to Chiangrai taked about 10 hours with 4 breaks.
The road was good, i went also to the Sirkit Dam ( Nam Pat), and from there over to Uttaradit, the road has many great corners.
About the Bikeweekend in Udon: my idea is that nezt year the organisers should do better there work, the ride was not organised, many of the bikers didn,t know where to go, and some of them went back to Udon on there own.Unfortunately, because like Peter says, there a lot of bikes.Anyway it was pleasant to meet some people though.