Captiva sits north of Sanibel across Blind Pass, reached by a single road. The resident population fell by nearly half between 2010 and 2020, which tells you how much of the island is second homes and rentals rather than year-round living.
There is a specific rule here worth knowing before you design anything. Lee County changed how building height is measured on Captiva in 2023, and ornamental elements may extend above the roof peak only if they cover no more than a fifth of the roof area. That is a roofing constraint, not just an architectural one, and it has been contested locally.