We visitid Cartgena 2 times. It is a nice plays, not to big, so easy to find your way. Nice centrum with a few historical monuments, worthwile visiting. Nice beaches neer the town.
Wath I liked is the combination of mountains and the sea. For that I choose this region. Rough cost with rocky beaches next to sandy beaches. It was a quiet at the beaches, but that can we different in the summer.