Just an hour's boat trip away from Cartagena lie the magnificent Rosario Islands, which belong to Colombia's only underwater natural park (Rosario and San Bernardo Corals National Natural Park). Abundant marine wildlife (including over 50 species of corals) and some of Colombia's best beaches draw in many in search of relaxation and active pursuits such as snorkelling and diving. Isla Grande is best for kayaking through unique mangrove forests and seeing the phosphorescent plankton light up the waters of a brackish lake at night, while Playa Blanca is Cartagena's most spectacular white-sand beach (also reachable by land). It should be said that the company you choose to tour with has the potential to make or break the experience. Low cost tours can mean multiple intermediate stops en route to your destination, as well as unpleasant surprises such as no transfer back to your hotel. Try and choose a trusted company with consistently good reviews, or opt for a private tour. Mind that seas may be rough at certain times of the year, particularly in December and January, when tours on smaller boats may even become dangerous.

Phœnix Parc Floral de Nice is the world’s largest greenhouse. Seven different tropical climates (damp, in other words) covering seven hectares, packed with 2,500 different plants. You can walk in the shadow of an (almost) unknown palm tree here, look at a baby shark, smell a thousand flowers and listen to bird song- on the loudspeakers.

Museo del Oro Zenú is Cartagena's response to the famous gold museum in Bogotá. Here you'll learn about the culture of the Zenú people through the artefacts of their tribe: over 600 gold, silver and ceramic pieces are on display. Other highlights include displays on body painting and textiles, and an exhibit focusing on the engineering prowess of the Zenú — learn how they built a vast network of canals over 2,500 years ago.

This magnificent 17th century mansion was built on the site of an original Medieval Castle and offers spectacular views over the city. Within the walls is a vibrant museum and art galleries, hosting both national and international artists. Guided tours of the caves beneath the Castle are also available where you can discover King David’s dungeon, the Duke of Newcastle’s Wine Cellar and Mortimer’s Hole.