Of course, as a PADI Course Director (inactive for about 15 yrs now) I cannot say that taking such an IDC instructor course with only an OW Cert is a good idea... even though they say they will get you through all the requirements in a month... simply not a good idea... unless you have several hundred dives under your belt BEFORE you go to Bonaire, in a wide variety of circumstances and environments, including night dives, wreck dives, cold water dives, merky water dives, high seas, flat seas, fresh water, etc etc etc.
That said, some of the best shore diving in the world can be had at Bonaire... I used to own a condo there and we went at least 4 times a year... there is a great wreck, albeit very deep beyond recreational limits, called the Windjammer, which is perhaps one of my favorite wreck dives ever... and there are even richer cave dives on the island... pink beach is great... as a shore dive, but all are fabulous...
Go and have fun, but as I have qualified this comment, be careful, and do not assume that just because you have a certification it means you are as qualified as others with far more experience...
Of course, I know many divers with only OW certs that have thousands of dives under their belt, but usually they would be well served by taking a couple of more courses, as it hones the skills and reminds one of safety issues...
Good luck...