The mangrove tunnels of nearby La Boquilla are an easy day trip from Cartagena. Guided tours will often combine a visit to the beach (one of the Playas De La Boquilla) with a boat or canoe tour of the mangroves, passing through Cienaga de Juan Polo and the Cienaga de la Virgen lagoons. Some tours will also include a closer encounter with local fishermen and offer insight into their craft. La Boquilla is an area of contrasts: the district of upscale hotels — Morros — borders on humble neighbourhoods populated by workers. When sitting down to tuck into no-frills seafood dishes served up by local eateries, make sure you're clear about the price of each item ordered from the get-go, as there have been reports of "surprise" bills amounting to several hundred US dollars.

While seasoned travellers may venture into Cartagena's gritty Bazurto Market on their own, those not yet toughened by locals-only markets of the region may prefer to explore as part of a guided tour. This sprawling market, where trade starts before the crack of dawn, features incredibly fresh produce and seafood from Cartagena and beyond. Much of it makes its way to the tables of local fine dining establishments within the space of the same day. There is plenty to look at and taste, including local street food and multiple succulent varieties of tropical fruit you're unlikely to have encountered before.

Saint Martin's Cathedral is a Gothic church with several chapels. It was consecrated in 1452. Between 1563 and 1830, 11 Hungarian kings and 8 queens were crowned here. The cathedral tower rises to a height of 85 metres and is topped off by a gold-plated replica of the royal Hungarian crown.