I assume you a refering to the Dominican Replublic in the Carribean?
I have not fished there personally, but if you do a search on "Google" or "Yahoo" - enter the words....
"dominican republic bonefish"
.....you will find a lot of useful references.
It looks like you should definitely take your saltwater fly-fishing gear!
Good luck and please post a report with pictures when you get back!