I agree you should have the site done in HTML for the search engines, you would get some great positions in free search for some of the pages you could develop and have optimized.
I would then work the directories and travel sites getting as many inbound links as you can.
After that I would spend an hour a day working on Travel Forums.... do a Google search for Travel Forum, Diving Forum, Scuba Diving Fourm etc. and find a few of those... say five or six that have a decent amount of traffic (look at how many posts there are and how many are made each day... obviously the more the better their traffic)... then register and start contributing to them... answer questions about travelling in the Caribbean, about diving and all the time have your signature (when you regiester for forums even like this one) you can usually add a signature with a link to your site.
Over time the signature will be checked out by lots of potential customers.

Also do a few banner exchanges with other Caribbean resorts that do not do diving, and other diving sites that are not in the Caribbean...

That should keep you busy!

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