Spend a full day from Cartagena at Playa Blanca on Barú—sunbathe on powdery white sand, eat a classic Caribbean lunch, then after dark board a boat to a lagoon where bioluminescent plankton lights the water with every movement. Learn practical tips for timing, gear, and conservation.
More ways to explore the area's outdoor wonders
Salt spray and Caribbean heat meet just after dawn as a minibus eases away from Cartagena’s clock tower and the road slices through mangroves toward Barú. By midmorning you’re sinking toes into the white sand of Playa Blanca; the sea pulls cool and insistent, inviting you into shallow, glassy water where shells clack underfoot and gulls wheel overhead.
Difficulty
easy
Duration
About 10 hours
Fitness Level
Suitable for most fitness levels; be comfortable entering shallow marine water and standing or treading during the lagoon swim
Wildlife
History
Barú was historically a fishing and quarantine area for Cartagena; its reefs and mangroves supported local livelihoods long before tourism expanded.
Conservation
Bioluminescent organisms are sensitive to light, pollution, and chemicals—stick to reef‑safe products, avoid single‑use plastics, and follow guides’ rules to minimize impact.
Reserve your spot on the Swim in Bright Plankton plus White Beach Baru with Lunch today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Bring reef‑safe sunscreen
Use a mineral-based, reef-safe sunscreen and reapply early in the day—avoid oils before entering the lagoon to protect plankton and reefs.
Waterproof your phone
Low-light photos are hard; a waterproof phone case or disposable underwater camera protects gear during the lagoon swim.
Plan for a late return
The plankton experience happens after sunset—expect to return to Cartagena late in the evening and plan transport accordingly.
Follow the guide’s rules in the lagoon
Stay calm, avoid soaps or lotions before entering, and limit splashing to minimize disturbance to the bioluminescent organisms.
Swimsuit and quick‑dry towel
Essential for the beach day and the lagoon swim; a quick‑dry towel speeds changes afterward.
Water shoes
Protects feet from rocky patches near boat landings and coral fragments on the shore.
Reef‑safe sunscreen
Protects your skin while minimizing harm to marine life—required for sensitive reef areas.
summer
Waterproof phone case or disposable underwater camera
Helps capture the glow without risking your device in salt water; image quality may still be limited.