I'd add a good book and Immodium to the list. Depending on where you're going, the food might be different than what you're accustomed to.
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What liveaboard are you going on? There will be some different suggestions for a Blackbeards cruise, vs. something like an Aggressor.
The best crew that I have been with. Great bunch, very helpful and lots of fun. You'll see LOTS of sharks and plenty of coral and small critters too. Don't miss the night dive at Rock 'n' Roll reef. Also, look out for 'suggestive' coral shapes at G-spot.Going on T&C Aggressor II.
If you are travelling alone, you'll be sharing your cabin with another diver (unless you have paid the single supplement or the boat is not full). Request the lower bunk because it is a double bed and more convenient. The cabin layout makes the upper bunk a bit awkward.
Not a need, but it's just nice to have a dry one to get into. Usually there is a place to hang suits so they dry fairly quickly, but probably not before the next dive. On land, often you'll do 2 boat dives and maybe not take it off or only to the waist, then it has until the afternoon to dry. On a liveaboard you'll want to take it off after each dive (as it's easy and more comfortable, plus they don't like wet stuff inside.) Then an hour or 2 later you'll be gearing up again.I'm also going on my first liveaboard dive trip (Rocio del Mar) next week. Forgive my ignorance, but why so many rash guards? I am bringing the one I own, but hadn't thought I'd need more.