It's kinda hard to give you guidance if you don't share your gpa and mcat. You don't have to give your exact gpa/mcat. Just give us a range of your overall gpa, science gpa and mcat. Likely, there are alternatives to your situation. Ex: overall gpa: 3.5-3.6 science gpa: 3.4-3.5. MCAT: 510-512
Nonetheless, it's not advisable to go to the caribbean if your gpa is not the greatest. You're at risk of failing out because the attrition rate (weed out rate) is high especially during the first semester. You need to ask yourself, what fundamental changes have you made to avoid the same mistakes from happening again. What will prove your current academic record wrong? As of right now, just hearing your gpa is worrisome. Unless, you've changed something drastically, going to the caribbeans shouldn't be an option. Making the same mistakes you did in undergrad will be trouble. On top of that, going to the caribbeans will make your journey to become a physician a lot harder than being in the states.