Bodrum Maritime Museum is a compact but useful stop in a town whose identity has always faced the water. Its models, photographs, shells, and boatbuilding material explain Bodrum's gulets, sponge divers, and Aegean maritime trade in a way the marina alone cannot.
It makes sense as a short indoor break between the castle, bazaar streets, and waterfront. The museum is small, so do not plan your day around it, but it adds welcome local texture to a resort town that can otherwise feel all restaurants and boat trips.