Neraida Floating Museum

Docked right at Flisvos Marina, the Neraida is a fully converted ship turned floating museum — one of the few of its kind in Greece. You can step aboard for free, join a guided tour, and explore its exhibitions without spending a dime. It's a genuinely cool concept that blends maritime culture with hands-on learning, and the educational programmes make it worth a stop even if museums aren't usually your thing.