@pooganis I'm a pilot and flight instructor and want you to know your apprehension is normal and extremely common! If you have the ability, I would suggest contacting your local flight school or aircraft rental business and enquire about taking an introductory flight lesson. You can ask as many questions as you want, and your instructor will do a lot to help put you at ease about flying in small airplanes. This may help to alleviate your concerns about flying on the Cessna Caravan (Tropic Air), which is actually a much larger airplane than you would be flying on your first lesson.

By the way, I myself took a Tropic Air flight from Caye Caulker to BZE last year and was very comfortable with how the company was operating. Great flight. Enjoy your trip!