Kealakekua Bay Snorkel Tour: Zodiac to the Captain Cook Monument

Kealakekua Bay is the best snorkeling on the Big Island, and the best part of it, the reef in front of the Captain Cook Monument, has no road. A Kealakekua Bay snorkel tour by boat is how most people get there, and the boat you choose decides how much of your morning is reef and how much is ride.

This page covers the Zodiac tour we book from Keauhou Bay, what it costs, who should skip it, and why a small fast boat beats a big slow one for this stretch of coast.

Why this made our list

The water is the first reason. Kealakekua Bay is a protected marine sanctuary, and on calm days the visibility at the Captain Cook Monument runs past 100 feet. The reef drops away from the shore under you, and the fish are thick because they are protected. It is the snorkel spot locals send their own visitors to. The white obelisk on the shore marks the place where Captain James Cook was killed in 1779, and the reef right in front of it is the one everyone comes for.

The boat is the second. This tour runs on a Navy-SEAL-style Zodiac, a rigid-hull inflatable that is fast, low to the water and small enough to get close to the coastline. It leaves from Keauhou Bay, just up the coast from Kealakekua, so you reach the bay quickly and spend more of the trip in the water.

The third is everything on the way. The coast between Keauhou and Kealakekua is lined with sea caves and lava tubes, and the Zodiac noses in for a look when the ocean allows. Spinner dolphins are often along this stretch, and from December through April humpback whales are too.

Why this operator

Hawaii Manta Ray runs this Zodiac as well as the manta night snorkel we rank first on our list. We compared the Kealakekua boats on three things: how long the ride takes, how many people are on board, and how much of the coast you see. The big catamarans out of the harbors farther north carry many more people on a longer ride. Kayaking the bay yourself is possible, but it is a paddle across open water and you see none of the coast. A small Zodiac from Keauhou gives you the reef, the caves and the dolphins in under three hours. Full details are on the Kealakekua Bay Zodiac snorkel tour page.

What the Kealakekua Bay snorkel tour is like

The trip runs 2.5 to 3 hours. Here is how it goes.

1. Check in at Keauhou Bay. The meeting spot is 78-7138 Kaleiopapa St, by the Keauhou Bay boat launch ramp. Arrive with your swimsuit on under your clothes.
2. Board the Zodiac. Find a seat, hold on, and the boat heads south out of the bay.
3. Sea caves and lava tubes. The coast is old lava cliffs, cut with caves and tubes. When the swell is down, the captain brings the boat in close so you can look up into them.
4. Dolphins and whales. Spinner dolphins often show up along this coast, and in winter you may see humpbacks. Federal rules keep boats and swimmers at least 50 yards from spinner dolphins in Hawaiʻi, so you watch them from the boat as they leap and spin.
5. Kealakekua Bay. The boat pulls up off the Captain Cook Monument, inside the marine sanctuary, and you slip into the water.
6. Snorkel the reef. Clear water, coral and reef fish below you. On calm days the visibility runs past 100 feet.
7. Run home. Back up the coast to Keauhou Bay.

Prices and what you get

The Kealakekua Bay Zodiac is from $95 per person plus tax and booking fees. Pricing is seasonal, so the rate on your date may be higher; the booking page shows it. You get 2.5 to 3 hours on the water, the snorkel stop at the monument and the coastline run. Gratuity is extra.

Cancellation is simple: you get a 100% refund if you cancel at least 72 hours before departure.

Who it’s for (and who should skip it)

Anyone from age 5 to 80 who is comfortable snorkeling in open ocean water. It suits families with kids who like speed, couples, and anyone who wants the best reef on the island without paddling to it.

Skip it if you want a smooth, shaded ride; a Zodiac is fast, open and can be bumpy. Ask before booking if you are pregnant or have back or neck problems. If whales are the main goal, look at our dedicated whale watching tour instead. And if you are a certified diver, our Kona scuba diving page covers the reefs from below.

Where to check in and how to get there

Check-in is at 78-7138 Kaleiopapa St, by the Keauhou Bay boat launch ramp, south of Kailua-Kona and about 25 minutes from the Kona airport (KOA). Hawaii Manta Ray has directions in its guide to getting to Keauhou Bay.

Best time to go

Time of day. Morning. The Kona coast is usually calmest early, which means clearer water at the reef and more chances to get into the caves. Departures are 8:00 am, 10:45 am and 1:30 pm; take the 8:00 if you can.

Time of year. Any month for the reef and the dolphins. December through April for humpback whales, with the peak from January through March.

Local tips before you book

• Book the 8:00 am departure. The calmest water of the day, on most days.
• Put on sunscreen before you leave. Reef-safe, and give it time to soak in before you swim.
• Wear a sun shirt. A Zodiac is an open boat with little shade, and floating face down over a reef burns your back fast.
• Hold on to your hat. Or leave it in the car.
• Look, do not touch. The bay is a marine sanctuary. Keep your fins off the coral and your hands to yourself, and the fish will come close on their own.
• New to snorkeling? Ask the crew for a flotation aid and practice breathing through the snorkel with your face in the water before you swim off. The water is calm and clear inside the bay on most days, which makes it a good place to learn.
• Make it a Keauhou day. The Kona manta ray night snorkel checks in at the same bay. Reef in the morning, mantas after dark.
• See the rest of the island. For everything else worth doing, read our things to do on the Big Island guide.

The verdict

If you snorkel one reef on the Big Island, make it Kealakekua, and get there on a small, fast boat from the closest harbor. This Kealakekua Bay snorkel tour gives you the Captain Cook Monument, sea caves, lava tubes and a good shot at dolphins in under three hours, from $95. Take the 8:00 am boat and pair it with the mantas that night.