March and Aprill are the hottest months in Thailand - protect kids from sun (even on the beach), let them drink plenty of water, take cooling shower as often as you can, ask your kids to wash their hands often and not to touch any animals (there are a lot of stray dogs and cats on the streets).
Because thai food is fiercely spicy first taste it before buying - children and those not familiar with chilli might have some stomach problems
Bookmarks