A typical Rosario Islands tour is a full-day boat trip (8–9 hours) that takes you about an hour and a half from Cartagena to a handful of small islands inside the national park. Expect clear water for snorkeling or swimming, a basic lunch usually featuring fish or chicken with rice and plantains, and several stops: one for snorkeling on the reef, another at a beach club with loud music and loungers, and often a final swim at a quieter cove. The boats are usually catamarans or speedboats carrying 15–40 people. It’s scenic but not remote wilderness—think pleasant Caribbean day out rather than pristine deserted islands.
Best time is December to April when seas are calmer and rain is rare. June–November can be choppy with afternoon showers; avoid if you get seasick easily. Expect to pay around $50–$110 per person. The cheaper shared tours get the job done; the higher end usually means smaller groups, better food, or access to a nicer private beach club.
Pick a tour that includes snorkel gear and at least two swimming stops. Skip the ones that spend too long at the party beach if you want tranquility. Bring reef-safe sunscreen, cash for drinks, and a waterproof bag for your phone—waves can get splashy on the ride back.
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