Nan is a town in the mountainous region bordering Laos, in northeast Thailand.
My suggestion
Rent a vehicle to explore the area. Nan is not a major tourist spot, so it may be useful to have a sense of Thai culture or at least a little dictionary so you can be understood.
The Khong Chiam region is still largely unaffected by tourism and, for those willing to explore it, offers spectacular scenery and the promise of peaceful days spent well away from the noise and chaos of the urban environment. With its waterfalls, cliffs and rock paintings, Pha Taem is the kind of place you simply never tire of exploring.