Dirty Rock, Cocos Island:
This site is spectacularly thick with hammerhead shark. The rock from which the site takes its name is covered in barber fish (the cleaner fish of the scalloped hammerhead), and if you can take your eyes off the hammers, you might also see turtles, marble rays, eagle rays, white-tip reef sharks, sea urchins, jacks, wahoo, and hunting tuna.
Viking Rock, Cocos Island:
A submerged reef noted for sharks and rays. Look for Galapagos sharks, white-tip reef sharks, marble rays, lobsters, moray eels, and pufferfish.
Bajo Alcyone, Cocos Island:
Position yourself near one of the cleaning stations on this seamount and you will be rewarded by a seemingly endless parade of hammerhead sharks. You might also see Mexican hogfish, wahoo, tuna, jacks, and dolphins.
Bajo del Diablo, Caño Island:
Majestic rock pinnacles tower over a maze of peaks and valleys with stunning visibility. This site boasts a wide array of fish life, including pelagic snappers and amberjack approaching 32 kilograms/70 pounds, schools of barracuda, reef sharks, eels, and giant manta rays.
Barco Hundido, Caño Island:
A sunken ship here gave the site its name that stuck even after the ship was salvaged and removed. Look for reef sharks, schooling grunts, snappers, blue spotted jacks, almaco jacks, crown-of-thorns sea stars, pufferfish, sand eels, stingrays, flounder, and manta rays.
Playas del Coco, Guanacaste:
Look for manta rays, whales, dolphins, turtles, spotted eagle rays, diamond stingrays, nudibranchs, bull sharks, white-tip reef sharks, octopus, eels, and schools of vibrant tropical fish. A volcanic rock sloping down to 26 metres/85 feet also offers opportunities for macro photography.
Volcanic rock formations attract rays, sharks, angelfish, grunts, snapper, octopus, eels, cow-nosed rays, manta rays, bat rays, mobula rays, spotted rays, bull’s-eye rays, and stingrays, as well as barracuda, white-tip reef sharks and tiger sharks, and sea turtles. It’s even possible to spot whale sharks, spinner dolphins, humpback whales, pilot whales, orcas, and false killer whales.
When currents and weather allow, dive along a rock wall that plummets to 42 meters/140 feet, contoured with bridges and caverns encrusted with coral and sponges. Look for bull sharks, black-tip reef sharks, tiger sharks, mating turtles, flying fish, rays, and sometimes orcas, humpback whales, and dolphins. Strong winds in the early months of the year might prevent access to Bat Island.
Chains of volcanic rocks and pinnacles are populated with schools of jacks, pompanos, manta rays, reef sharks, giant manta rays, mobula rays, stingrays, octopus, sea turtles, groupers, snappers, angels, moorish idols, trumpetfish, eels, crustaceans, schooling barracuda, jacks, grunts, and even dolphins and humpback whales.
Playa Flamingo, Guanacaste:
Enjoy sightings of vibrant tropical fish, giant manta rays, dolphins, sea turtles, eels, angelfish, parrotfish, puffers, clown shrimp, spotted eagle rays, cow rays, barracuda, hogfish, white-tip reef sharks, whale sharks, and bull sharks.