Despite the many confusing ideas TripAdvisor might put in your head, the cheapest way to get from Bangkok to Koh Tao is using the Lomprayah service. The ticket costs 1050baht per person and includes the bus and high speed ferry.
We thought land travel was tricky in Malaysia, seems like we were wrong. There is no efficient nor cost effective way to travel from Trang to Koh Tao. We went to a travel agent and they quoted us about 1300baht each to take a minibus to Surat Thani and then a night ferry to Koh Tao. Our other option was to make our own way to Krabi and stay an extra night, then go with a minibus from Krabi to Surat Thani and take the speedboad. This was 850baht per person, of course excluding the night’s accommodation and trip to Krabi. We really didn’t know and wanted to go the…