The workhorse crossing: buses from town, train and airport meet the Donsak ferries all day long - and a night boat for romantics.
Find a room before you go.
Buy the bus-and-ferry combo from the station, airport or town and everything connects: the coach rolls onto the pier as the ferry loads. The big car ferries are steady, cheap and frequent - the default answer for reaching Samui from the mainland.

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Hourly-ish departures all day. About three hours door to door from the city, longer from the airport with the transfer.
Faster on the water for a little more - worth it if your combo ticket offers the option.
The old wooden boat leaves Surat town pier around 11 pm with mattresses upstairs, landing at Nathon before dawn. A backpacker institution.
Step-by-step transport guides for this stretch of the Gulf coast.