Thailand is the country in Southeast Asia most visited by tourists, and for good reason. You can find almost anything here: thick jungle as green as can be, crystal blue waters that feel more like a warm bath than a swim in the ocean, and food that can curl your nose hairs while tap dancing across your taste buds. Exotic, yet safe; cheap, yet equipped with every modern amenity you need, there is something for every interest and every price bracket, from beach front backpacker bungalows to some of the best luxury hotels in the world.

And despite the heavy flow of tourism, Thailand retains its quintessential Thai-ness, with a culture and history all its own and a carefree people famed for their smiles and their fun-seeking sanuk lifestyle. Many travellers come to Thailand and extend their stay well beyond their original plans and others never find a reason to leave. Whatever your cup of tea, they know how to make it in Thailand. One thing that traveler impress in Thai peoples, it is kindness. On the bus Thai will give a seat for child, old people, disable person, and woman who is pregnant. However, traveler confuse something that Thai people do. For example, Thai people drink Pepsi in plastic bag. Thai people hit child by stick, because Thai people believe if you love child, you could hit child.
This is not to say that Thailand doesn’t have its downsides, including the considerable growing pains of an economy where an agricultural laborer is lucky to earn 100 baht per day while the nouveau riche cruise past in their BMWs, Bangkok, the capital, is notorious for its traffic jams and rampant development has wrecked much of once-beautiful Pattaya and Phuket. In heavily touristed areas, some lowlifes have made scamming tourists into an art form. Immigration queues are often long, giving travellers bad first and last impressions. And when tourists are attacked or murdered, there is often little police follow-up.
(http://wikitravel.org/en/Thailand)
Here is the list of 10 best places to visit and see in Thailand: