Cinman -- regarding "any tips" -- well here are some:
a. Bring all of your own gear that you can because that is what you know. Start with your Mask and Fins (take a snorkel too because you might want to snorkel there) and if you needed to wear booties with your fins, booties too. You need (yes need) a dive computer, if you don't have one FOR EACH OF YOU, you've just increased the cost of your trip by several hundred dollars. READ THE MANUAL. Make sure you can, and do, download the data after each day of diving and look at your profiles -- too deep, just right, what.
b. ASK QUESTIONS of your dive operator. Tell them you are new divers AND CAUTIOUS ones. Do not let them take you on a dive that worries you -- however, doing a later dive that might push you a bit may not be the worst thing either.
c. DO NOT TAKE A CAMERA. You are new divers and will have enough to think about without the added stress of a camera. Ask others on the boat if they will share their pictures with you. Facebook (or whatever) will be your friend.
d. Do not drink too much in the evenings (he writes with a sad, knowing smile).
e. HAVE FUN.
And yes, there is much, much more to write but HAVE FUN. Oh, and try to get back into the pool at least one more time before you go.