用英文介紹泰國..

below are some information for your reference
you can also have other info from the thailand tourism board as well... and the link are listed in the Reference section
so, you can tailor to however you want :)

The kingdom of Thailand lies in the heart of Southeast Asia, making it a natural gateway to Indochina, Myanmar and Southern China. Its shape and geography divide into four natural regions : the mountains and forests of the North; the vast rice fields of the Central Plains; the semi-arid farm lands of the Northeast plateau; and the tropical islands and long coastline of the peninsula South.

The high Northeast Plateau, which still jealously guards its many archaeological and anthropological mysteries;

The Central Plain, one of the world's most fertile rice and fruit-growing areas with colourful traditional culture and way of life as well as the sandy beaches of the East Coast and vibrant cosmopolitan Bangkok;

The peninsular South where the unspoiled beaches and idyllic islands complement economically vital tin mining, rubber cultivation and fishing.

Population: Thais are well-known for their friendliness and hospitality. A large majority of over 62 million citizens of Thailand are ethic Thai, along with strong communities whose ethnic origins lie in China, India and elsewhere. About 7 million people reside in the capital city of Bangkok.

People: Thai (80%), Chinese (10%), Malay (3%), and the rest are minorities (Mons, Khmers, hill tribes) Ethnic Thais form the majority, though the area has historically been a migratory crossroads, and has thus produced a degree of ethnic diversity. Integration is such, however, that culturally and socially there is enormous unity.