Nothing that bad. Sorry, just had to pick at you a little, hope no offence was taken. I do get a kick out of first timers wanting to plan next years trip before we leave the island....trip #11 coming in July....for 2 weeks!......and I have an Amstel in my hand now..*$%*^!! PBD!
Here are few more tips for you.
From home take a 2L bottle cap with 3 or 4 holes drilled in it. On island,when you empty a 2L bottle, fill it with water and lay it in the sun (truck hood is great) before the dive. After the dive replace the normal lid with your drilled lid..cheap, instant solar shower. It's really nice for a face wash after a dive. If your leading a group, you will make a big hit with this.
Buy everyone a 1L bottle of water (I like squirt top kind) at the beginning of the week. After you empty it, refill it 1/2 way from the tap and place in the freezer on it's side (don't let the water block the mouth) until your next dive. Then fill it with tap water and wrap it in your dive towel for after dive hydration. The island heat is deceptive due to the constant winds, you need to drink lots. Luckily the tap water is safe to drink...and taste good to boot.
There is no need to carry much on the island. All I carry when traveling to and from a dive site is 1 credit card and a $20 in a waterproof (yea right) case. That is plenty for anything I need to do on the island between dives, no need for C cards, more cash or the like. Everything else stays in the ROOM SAFE. I also put my car keys in the wp case when diving and that goes in my BC pocket. All the stores are use to wet cash.
I am sure you have seen this. Don't leave anything of value in your vehicle while diving. Leave the windows down and the doors unlocked. The breakin problems on island are not nearly as bad as some would have you believe but it does happen..so far 10 trips using this advise and zero problems. Towels, old shoes and tshirts have not been messed with.