When I came to Koh Tao, I went to Big Blue Office in Sairee Village and booked my Open Water course. The course was amazing, we got all the theoretical information we needed and learned to dive in the pool first. The next day we started to go to the wonderful diving sites around Koh Tao where we had lots of fun on the boat and some amazing dives! Our group was not too big (around 5 people), because they had split the group. After the Open Water, I decided to do the Advanced Course, which was even more amazing - I dived with a whale shark on my 5th dive.... Also, our diving instructors Steveo and Lilie were just awesome! During the courses, you can have free accommodation in a dorm. Good equipment, high safety standards, a good restaurant and amazing people! All in all a brilliant experience at Big Blue.