Thailand is a great place to relax and\or explore,
for those who wish to explore, I'd recommend to try to eat where only Thai people eat, take some local transportation, and to try to get off the turistic route.
for those who wish to relax, there's a medium size village up north, called Pai, it's a nice place to visit with a little of evry good thing Thailand has to offer (Good food, Good hospitality, great views, Massage, Shopping...).
this village is about 4 hours north of the city Chiang Mai.
Have Fun !