Are you going to be dependent on the money that you might make or would it be a nice extra?
If you would need the income do you have enough savings to cover the trip, a down payment for an apartment or house, expenses for a couple of couple of months and your return ticket?
If it would be a nice extra I guess you should try to find a place with a kitchen that's good enough to "do your thing" and then hook up with people who organize parties, boat trips etc.Â
One way or another, trying to get something going will involve a lot of hard work and it will take quite some time before you make a profit. Keep in mind that for catering food you will need a license and permit(s). I wouldn't be surprised if the licensing authorities will require taking a course (and that will be in Spanish).
Maybe it's a plan to contact restaurant owners in the area and see if they need seasonal help. That would get you in to the local scene which in turn will improve your chance to successfully start something on your own account.
Starting a business is not easy (I know, BDDT I've been self-employed for almost 30 years) and starting a business in a foreign country (I know, PR is USA but it is a foreign country in many respects) is even harder.