Cycling near Chiang Rai

[BT444]

I've never ridden up there but am considering taking a bike trip. 

 

Anyone cycled south of Chiang Rai and around Doi Luang National Park?

 

Specifically, a  large loop down Highway 1 (east side of Doi Luang), northwest up Highway 120 and north up Highway 118?  

 

Also, what dangers&considerations are there for riding in that area? Eg, are there lots of shops/711s/restaurants by the highway? What is the condition of the roads? 

 

Any help would be appreciated!