Hi, I'm not currently living in Fort Lauderdale (I go to school in North FL) but my "home" is really close!
Anyways- for such a short trip, I'd say Whole Foods is your best bet. Try looking on happycow.com for any other little health food stores.
And Olivia- you might be interested in getting some tropical fruit from Jourdan. The website is www.jourdansbeautifulfoods.com
Hope you both have an awesome time :)