A three-day Similan liveaboard and a six-day one dive largely the same core sites; the extra days mostly buy you Richelieu Rock, Koh Bon, and Koh Tachai as add-ons further north. Route matters more than boat luxury for most divers deciding between options.
How do I choose a Similan Islands liveaboard?
Start with the route, not the boat. Confirm exactly which sites are on the itinerary, since "Similan Islands" trips range from a tight southern-park loop to a full run up to Richelieu Rock. After that, check cabin count and diver-to-crew ratio; a smaller boat with fewer bunks generally means more attentive dive briefings and less crowding at entry points.
What's included in a typical Similan liveaboard trip?
Full board (meals, cabin, nitrox on most boats for a supplement), dive guiding, and tank fills are standard. Marine park fees, alcohol, and gear rental are commonly extra, so check the quote breakdown rather than assuming an all-in price covers everything.
How many dives per day on a Similan liveaboard?
Three to four dives per day is typical, usually including one night dive on at least one evening of a multi-day trip. Expect an early wake-up for the first dive, since operators favor pre-breakfast dives when the boat traffic on popular sites is lightest.
Is a 3-day or 4-day Similan liveaboard better?
A 3-day trip covers the core southern and central Similan sites and suits divers on a tight schedule or budget. A 4-day (or longer) trip adds Koh Bon and Koh Tachai, both known for manta and whale shark chances, and sometimes Richelieu Rock further north; if those specific sites matter to you, the extra day is worth the added cost.
What's the cabin/berth quality like on budget vs premium boats?
Budget boats typically run shared bunk-style cabins with basic bathroom facilities, fine for divers who spend most waking hours in the water anyway. Premium boats add private en-suite cabins, air conditioning throughout, and better common areas, at a meaningfully higher price point. Neither affects the diving itself much; it's mostly a comfort-and-budget tradeoff.
Do Similan liveaboards visit Richelieu Rock and Koh Bon?
Only the longer itineraries, generally 4 days or more. Richelieu Rock sits well north of the Similan park boundary and Koh Bon sits between the two, so a strict 3-day Similan-only trip usually skips both. Confirm the specific route before booking if either site is a priority for you.
What should I pack for a Similan liveaboard trip?
A dive computer and backup mask, since replacements aren't always available onboard
Reef-safe sunscreen, required at some marine park sites
Seasickness medication if you're prone to it, taken before departure rather than after symptoms start
Cash for the marine park entrance fee and any onboard extras, since card payment is inconsistent on smaller boats
FAQ
Are Similan Islands liveaboards worth it if I get seasick? They can still work with proper preparation, mild pre-dose seasickness medication and a mid-deck cabin (less motion than bow or stern) both help considerably. If you're severely prone to it, a day-trip option lets you test the crossing before committing to a multi-day boat.
How far in advance should I book a Similan liveaboard? Peak season (January-March) boats fill up weeks to months ahead, especially smaller or premium boats. Shoulder months (November, April) generally have more last-minute availability.
Is nitrox included, or does it cost extra? It varies by operator; some include unlimited nitrox in the trip price, others charge a daily supplement. Confirm this specifically when comparing quotes, since it changes the real cost difference between boats.
