I have been to every country in Asia, Southeast Asia as well as India. My favourite spot for a holiday is Thailand! It is a diverse country that is the same distance from top to bottom as Seattle to San Diego.
There are mountains, plains, and of course the seaside. Each area has a different cuisine as well. Issan, the plains area of Northeast Thailand has fabulous snack or as they are called drink-foods. The south of Thailand cuisine includes a lot of seafood and quite spicy curries, some with a hint of Indian influence.
No matter where you decide to travel in Thailand you will encounter a wonderful culture, gorgeous scenery, and wonderful food.