I'm going on a trip to Jamaica in two weeks. Is there any way to lose weight before that

You may lose, one or two pounds, but not any weight loss that will make any real difference. Weight loss is a long term project, taking months.

Proper diet plan with a big NO to soft drinks ( coke, pepsi, etc) can b a little useful but 15 days are not enough to lose more than 2 to 3 pounds