You are clearly quite knowledgable and practiced in the art of deduction. Thank you for the quick response!

Now that I've thought about it more, the external bolt heads tipped me off immediately too, but, being found in the Bahamas, so close to Cape Canaveral, it was very likely to be a rocket fairing even when one doesn't consider the more technical evidence. Seems like a lot of people here are underestimating the effects of drag on aircraft and ignoring this fact.

Secondly, airplane parts of that size are usually not found, well, anywhere except the manufacturing plant or a plane graveyard, without the rest of the plane somewhere nearby. If a plane lost that big of a chunk of its fuselage (which already indicates an apparent radius for a fuselage larger than most and potentially all planes), it wouldn't be airborne for long, and the rest of it would be have landed within a few miles. Something tells me that fairings fall to the earth and wash up on shores far more often than plane parts, too. Additionally, it looks to purposefully detach from whatever it belonged to, as there is no indication of damage or overt stress/shear, as there would be in an midair incident with a plane or naval combat.

Last of all, nobody would have taken a large plane out onto the beach, where a massive part fell off; it's also unlikely that someone would have lugged it from a scrapyard to the ocean to dump, so it likely washed up from the ocean. Finally, other commenters provided some valuable insight, too, as a few have stated that the debris has been there for a very long time. Someone else mentioned that rocket fairings still belong to whatever company made them, indefinitely, so nobody would be allowed to take this off the beach to scrap or sell it. That it has not been repurposed or moved in so long seems to be one of the most telling pieces of evidence, as I bet that the locals are very much aware of the illegality of doing so, precisely because it is a rocket fairing and not some scrap from an aircraft or ship.

Phew! I think that ties it off when you consider the pictures that were provided. Let me know if I made any weak assumptions!