Snorkeling the Catalina Islands: What You Will and Won’t See

Search for the Catalina Islands and you will mostly find manta rays. Enormous ones, gliding past divers, in photographs that have sold a great many boat seats. If you are planning to snorkel there, you need to know something that the photographs do not mention.

So a snorkeling trip to the Catalinas is not a manta trip with a cheaper ticket. It is a different day out, and judged as that it is a good one. This guide is about what it actually is.

The Catalinas are a scatter of bare volcanic rocks off the Guanacaste coast, roughly between Playa Flamingo and Playas del Coco — Rich Coast Diving puts them “off the Pacific coast near Playas del Coco”. Nobody lives on them. There is no beach to land on. Every trip is a boat trip that anchors off the rock and puts you in the water beside it.

That matters for what you see. The draw is not coral — this is the eastern Pacific, not the Caribbean, and you should not arrive expecting a reef garden. The draw is the rock itself: vertical walls dropping into blue water, and the volume of fish that gather around them. Snorkeling here is about schools and structure rather than colour.

This is the part that catches people out, and it comes from putting two ordinary facts side by side.

The dry season in Guanacaste runs roughly December to April, and it is the obvious time to plan a boat day — less rain, less runoff, generally better visibility. The manta season overlaps it almost exactly: November to April, per the dive centre.

But the Papagayo winds run on the same calendar. Las Catalinas describes them: “The Papagayo winds occur mainly between December and April, when cold air masses from North America move south and are funneled through mountain gaps near Nicaragua.” On a strong Papagayo day the crossing is bumpy and the surface is chopped up. Rich Coast Diving refers to “the often challenging surface conditions” at the islands as a reason snorkelers are kept off the manta trips at all.

The standard Catalinas snorkeling trip out of the Flamingo area runs about five hours door to door and gives you two 40-minute sessions in the water, with hotel pick-up from selected areas, gear, a guide and snacks on the boat. It is listed from $115 per person and rates 4.56 from travellers.

Two forty-minute sessions is the number worth holding on to. Most of a five-hour trip is transit, briefing and surface interval. If your mental picture is a whole day in the water, adjust it — and if that sounds thin, a catamaran day out of Flamingo or Tamarindo gives you less time at a serious site but more time on a boat, which for a lot of people is the better trade.

There is no snorkeling route to them. The options are a certified two-tank dive at the islands, from $162, or — if you have never dived — an introductory dive with an instructor, which is a different thing again and is covered in its own guide.

And whichever you book, hold the expectation loosely. The dive centre is direct about it: “Manta ray sightings are not guaranteed, as they are wild, pelagic animals.” During the season it says “encounters are frequent”, which is an honest way of putting it and not the same as a promise.

Costa Rica’s marine park rules prohibit touching, feeding or harassing marine animals, and that is the standing expectation on any guided marine trip in the country — not only inside a park boundary. A guide who encourages you to touch something is not giving you a better trip.