Graham T.
Google
This historic fort, now a museum, is right next to the cruise ship terminal so its easy to visit this star shaped fort (with a moat and portcullis). It is full of cannon, excavations showing original foundations, and cultural exhibits representing both Spanish and Japanese early travelers and influences on the Mexican culture. You can also see Mayan artefacts, armor for horses, and knights, ancient sea chests, and of course you can wander the battlements and sight along the cannon barrels out into the city or bay.