If you’ve ever thought about getting your scuba diving certification Koh Tao is one of the best if not the best place in the world to do it. There are dive shops galore offering just about every course available. The PADI open water course costs about US$300 and takes 4 days to complete. The cost usually includes accommodation. Koh Tao is the cheapest place in the world to do the open water course and offers really good dive spots to practice your skills. I did my course with Davey Jones’ Locker (DJL). The staff there was really friendly, knowledgeable, and did a great job teaching me the course and keeping me away from the coral underwater.
There are loads of restaurants, dive shops, hotels, bungalows, and bars in the main town in Koh Tao. Just like in the other islands there are nightly fire shows at some of the restaurant / bars on the beach.
I spent my entire time in Koh Tao doing the dive course so I didn’t see the rest of the island. The easiest way to get to Koh Tao from Bangkok is to book a train + bus + ferry combo at the central rail station. There are friendly English-speaking staff there to help you. You can also take a ferry from Koh Samui or Koh Phangan to Koh Tao.