Khao Sok is a national park north of Phang Nga Bay, not far from the tourist island of Phuket. 
Sukhothai was the Kingdom of Siam's first capital city and is today listed as a UNESCO World Heritage.
The Golden Triangle is a mountainous region which straddles northern Thailand, Laos, and Myanmar and through which the river Mekong flows.
Ancient capital of the kingdom of Lanna, Chiang Mai is "the Rose of the North", famous for its mountains and the tribal villages which encircle it.
A UNESCO World Heritage Site, Khao Yai is Thailand's oldest national park.

Pai

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Enjoy a visit to this charming village perched up in the hills, with its calm, relaxing atmosphere!
A stay in north Thailand is unmissable and, while you are visiting Chiang Mai, don't miss the temple of Doï Suthep.
Phuket is the largest island in Thailand; very popular, but big enough so you don't feel like you're tripping over each other.
If you are looking for a paradise on earth, the Phi Phi island group (which includes Ko Phi Phi Lee and Ko Phi Phi Don) in the Andaman Sea is well-equipped to feature in your top ten list of options. 
The highest summit in Thailand is a great place to go for a day trip.
Ko Samet is a small island forming part of a national park and located off the coast of Rayong in eastern Thailand.
Makhon Pathom is a typical Thai provincial town, west of Bangkok, famous for its chedi which is the biggest in the world.
Erawan National Park is a veritable treasure of Thai nature.
Ko Pha Ngan is a paradisaical island with very varied scenery in the Gulf of Thailand.
Winding roads, hidden temples, and unspoiled nature await on an unforgettable trip to Mae Hong Son.
A small coastal town in southern Thailand, Krabi is the ideal starting point to discover white sand beaches, each more beautiful than the next.
Sculpted cliffs, golden beaches, and long-tail boat rides among karst islets.
Ayutthaya was the second historic capital of Thailand, then known as the Kingdome of Siam. The city was founded in 1350 and today still houses the remains of ancient temples.
Chiang Rai is a town perched in the mountains in the northern part of the country, near the border between Laos and Myanmar and the famous Golden Triangle. 
Bangkok is the capital of Thailand. Once a small commercial town on the banks of the Chao Phraya river, nowadays the town has more than 8 million inhabitants, and is the symbol of the country's economic development.

Tour ideas for Thailand