Got 4 nights spare. Starting in CM. Can do either loop. I know Rai, Chiang Dao and Pai a bit. I don't know the other places.
The other option is just do stuff near CM like sticky waterfall and that short Samoeng Loop.
What would you recommend?
Polluted in all main cities. Rubbish everywhere. Lots of food bugs, poor hygiene.
The average Thai couldn't locate NZ on a map. Don't tell me education is good.