The main gateway crossing to the diving island - fast catamarans, honest slow boats and one legendary midnight sailing.
Find a room before you go.
Lomprayah's big catamarans do the crossing twice daily in well under two hours and connect straight through to Koh Phangan and Samui. Slower boats save a little money; the night boat saves a hotel night and delivers a story.

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Morning and midday sailings timed for the Bangkok trains and buses. Air-con cabin, luggage handled, the standard choice for good reason.
Songserm and others run cheaper, slower crossings - fine on calm days, longer when the Gulf chops up.
Mattress-on-deck sailing leaving around midnight, arriving at first light. Take a jumper; the breeze gets cool at 3 am.
Step-by-step transport guides for this stretch of the Gulf coast.