Cocos Island National Park: A Tropical Paradise for Adventurous Travelers

You cannot simply visit this island

There is no ferry, no day trip, no resort dock. Cocos Island, or Isla del Coco, sits about 550 kilometers off Costa Rica’s Pacific coast, and the only realistic way to get there is a multi-day liveaboard dive expedition departing from Puntarenas, with the crossing itself taking roughly 32 to 36 hours each way. Landing on the island is tightly restricted and only permitted with a park ranger present, no camping, no overnight stays, and absolutely no collecting of plants, animals, or minerals. Most trips that do go ashore are attached to a research program rather than general tourism. If your goal is to set foot on Cocos Island proper, plan for that separately; if your goal is the diving, the boat is the entire trip, and that’s the point.

An endemic palm, correctly identified

Older write-ups of Cocos Island sometimes misname its signature palm as a subspecies of the Chilean wine palm, Jubaea chilensis, which is simply wrong: that species is native to Chile, thousands of kilometers south, and has no verified endemic subspecies on this island. The actual endemic palm here is Rooseveltia frankliniana, sometimes just called the Cocos palm, named for a presidential visit to the island in the early 20th century. It grows abundantly across the interior and is one of roughly 70 endemic plant species recorded on an island of only about 24 square kilometers, alongside 64 endemic insect species and two endemic reptiles, an extraordinary concentration of unique life for such a small landmass.

Why divers actually come here

The reputation rests almost entirely on schooling hammerhead sharks, and the numbers back it up: Cocos hosts some of the largest schooling aggregations of scalloped hammerheads anywhere in the world, drawn to cleaning stations where smaller fish pick parasites off them at close range to divers. The rainy season, roughly June through November, brings the largest hammerhead schools along with a better chance at whale sharks, while the December-to-April dry season trades some of that shark density for calmer seas and clearer visibility. There’s a real tradeoff here rather than one obviously correct season, and which one suits you depends on whether you’d rather fight slightly rougher conditions for bigger animal encounters or dive in calmer water with better photography light.

Money and permits, current as of 2026

A 2026 ten-day expedition on a dedicated liveaboard runs in the range of 7,000 to 7,500 US dollars for the trip itself, and on top of that every passenger pays a separate national park fee, currently in the neighborhood of 500 to 550 dollars, collected by the Costa Rican park service rather than the boat operator. That fee structure catches some divers off guard because it isn’t always advertised alongside the headline trip price. Berths on the handful of operators running this route sell out well ahead of peak season dates, so booking six months to a year in advance isn’t excessive caution, it’s close to necessary if you want a specific departure window.

The treasure legend nobody has ever proven

Long before diving tourism existed, Cocos Island had a reputation as a pirate hideout thanks to its reliable freshwater supply, and the most famous story attached to it involves Captain William Thompson, who allegedly buried the Treasure of Lima somewhere on the island in 1820 after murdering the Spanish officials who’d entrusted it to him. Hundreds of documented expeditions have searched for it since, including one German adventurer, August Gissler, who lived on the island on and off from 1889 to 1908 hunting for it and came away with little more than a handful of gold coins. Digging or excavation of any kind is now completely prohibited on the island, which effectively closes the treasure-hunting chapter of Cocos Island’s history for good, whatever’s actually down there.

A conservation story still unfolding

In 2021, Costa Rica dramatically expanded the protected marine area around Cocos Island from about 2,000 to over 54,000 square kilometers, and the following year Ecuador established its own Hermandad Marine Reserve protecting a further 60,000 square kilometers around the Galápagos. Together these form a protected migratory corridor for hammerhead sharks, leatherback turtles, and other wide-ranging species moving between the two island groups, and researchers have been deploying acoustic tracking receivers along this corridor to map exactly where the animals travel and where additional protection might still be needed. This is genuinely new and still developing conservation infrastructure, not a static, decades-old designation, so ask your dive operator whether their itinerary participates in any of the ongoing tagging or citizen-science research, since several do.

My take: pay the premium for an operator that partners with the shark research programs rather than the cheapest boat available. The extra cost usually buys better crew expertise around the animals, and the data collected genuinely feeds into the conservation work protecting the reason you’re there in the first place.