We had booked a ferry/tuk-tuk/train combo to get back to Bangkok from Koh Tao with the least hassle possible. The ferry left in the afternoon, giving us an entire morning to swim in the ocean for the last time, hang out at our favorite restaurant for the last time, and being happy to finally escape the party island that Koh Tao has become ;-)
The ferry was crowded with the scantily-clad, drunk tourist crowd you'd expect on a party island, and so I settled down listening to music and keeping my eyes closed to avoid becoming seasick. In Chumphon, we were transferred to the train station in a tuk-tuk, and then only had to wait for about an hour for our train to arrive. Despite it being only 8:30, our made-up beds greeted us already, and I fell asleep instantly.