Any particular types of guitars that you are looking for ? It's been decades since I've lived in Tampa but I'm pretty sure there are some Guitar Centers there. They stock Martin, Taylor and other well known major brands.

You might check the website of you favorite guitar maker and see if their dealer list has a location near where you will be visiting.

Again - if I knew more about what you were looking for - new or vintage - I might be of more help.

Good luck and use sunscreen.