Hi (name of friend / neighbor / colleague).
We're having a great / wonderful / fantastic / fabulous time here in Pai.
The weather here is chilly / sunny / perfect / romantic
and we're spending most of our days by the river / reading / sightseeing / relaxing / exploring the village.
The food we have is appealing / spicy / tasty / mouthwatering
and the local people here are also friendly / quite talkative / generous.
See you on (day you get back)
Love