What Are the Rosario Islands?
The Archipiélago de las Islas del Rosario is a protected national park of 28 coral islands and surrounding reef, located 35km southwest of Cartagena in the Caribbean Sea. The water — clear, turquoise, and coral-rich — is everything that Cartagena's bay is not (Cartagena's bay suffers from turbidity and pollution from the city and port). A day trip to the Rosarios is the standard Caribbean beach complement to Cartagena's colonial sightseeing, and on a good day the snorkelling and the visual quality of the water fully justify the journey.
Rosario Islands Tour Cost and Options
Shared day tours depart from the Muelle de los Pegasos (the tourist pier near the clock tower in the old city) every morning between 8am and 9:30am, returning at 4–5pm. Shared tours cost $30–50/person and include speedboat transfer, beach time at one or two islands, and (depending on the package) an aquarium visit, snorkelling equipment, and lunch. Private tours ($150–300 for the boat, regardless of group size) allow more flexibility in island choice and timing — worth considering for groups of 4+ where the per-person cost approaches the shared tour price. The speedboat journey takes 45 minutes each way.
Which Island to Choose
Playa Blanca (Barú Peninsula): The most popular beach day trip destination from Cartagena — technically not in the Rosario Islands proper but a white-sand beach on the Barú Peninsula accessible by boat alongside the Rosarios. The beach is beautiful but very crowded on weekends and with vendors who can be persistent. Best visited on a weekday or early in the morning. Isla Grande: The largest island in the Rosario archipelago, with basic accommodation options, reef snorkelling from the beach, and a quieter atmosphere than Playa Blanca. Cholon: A sandbar island famous for its floating bar and party atmosphere — appropriate for the right kind of day out, less so for serious snorkelling.
Islas del Rosario Snorkelling Guide
The reef quality in the Rosario Islands has declined over the past 20 years due to coral bleaching (water temperature increases from climate change) and the cumulative impact of daily tour traffic. The best-preserved reef sections are on the eastern side of the archipelago, away from the most-visited beaches. Ask your tour operator specifically about reef quality when booking — operators who run smaller tours and visit less-trafficked reefs will give more honest answers. Bring your own mask and snorkel if you have them; rental equipment quality varies. Best visibility: morning (before wind picks up), dry season (December–April).
Practical Tips
Book your Rosario Islands tour directly at the pier or through your hotel — avoid the touts who approach on the street offering the same tours at higher prices. Bring reef-safe sunscreen (conventional sunscreen damages coral; the park rangers occasionally check). The shared boats are open speedboats — the 45-minute crossing can be rough in windy conditions. If you are prone to seasickness, take medication before departure. The return journey in the late afternoon is typically rougher than the morning outward crossing.
