Snorkeling & Diving

The Best Snorkeling on the Big Island: A Complete Guide

The Big Island’s volcanic coastline creates some of Hawaiʻi's most dramatic underwater scenery. We'll guide you to the clearest waters, most vibrant reefs, and abundant marine life.

August 25, 2026 • 9 min read • by Big Island Tours Editorial

The Big Island’s underwater world is as dramatic as its volcanic landscapes. Unlike the other Hawaiian islands, its coastline is young, defined by dark lava rock that drops into deep, clear water. This creates an unparalleled snorkeling experience, with vibrant coral gardens, ancient sea caves, and a dizzying abundance of marine life just a few feet from shore.

From the protected coves of the Kona coast to the sun-drenched beaches of Kohala, the island offers a spot for every skill level. Whether you’re hoping to swim with spinner dolphins or just float above a colorful reef, our guide will show you where to go, what to look for, and how to do it safely.

Understanding Big Island Snorkeling

The snorkeling on Hawaiʻi Island is concentrated almost exclusively on the west side, along the Kona and Kohala coasts. The island’s massive volcanoes, Mauna Loa and Mauna Kea, block the prevailing tradewinds, creating calm, clear conditions perfect for underwater exploration. The geology here is key: ancient lava flows have formed a complex underwater shelf with caves, arches, and ledges where coral and fish thrive.

The east side, near Hilo, faces the open ocean and receives significant rainfall. This results in rougher seas and freshwater runoff, which reduces visibility and inhibits coral growth. While there are a few protected swimming areas, the premier snorkeling is unequivocally in the west.

Water temperatures are comfortable year-round, typically ranging from 75°F in winter to 81°F in summer. Visibility often exceeds 100 feet, especially in the mornings before the wind picks up.

Our Top Snorkeling Spots on the Kona Coast

The South Kona district is home to what many consider the two best snorkeling spots in all of Hawaiʻi. These are must-visit locations for any serious snorkeler.

1. Kealakekua Bay (Kaʻawaloa Cove)

Universally acclaimed as the best snorkeling on the Big Island, Kealakekua Bay is a state historical park and underwater conservation district. The cove at the northern edge of the bay, fronting the Captain Cook Monument, is a pristine aquatic sanctuary. The reef drops off from the shore to over 100 feet, with coral formations of staggering size and complexity. Here, you can expect to see huge schools of fish, eels, and often a pod of spinner dolphins (naiʻa) that frequent the bay to rest.

Access: This is the main challenge. There is no road to the monument. The only ways to get here are by boat tour, a permitted kayak, or a strenuous and steep 3.8-mile round-trip hike down the pali (cliff). For most visitors, a boat tour is the most practical and enjoyable option. Many excellent local companies offer morning snorkel cruises.
Skill Level: All levels (if arriving by boat). The cove is protected and generally calm.
Best For: Unmatched coral health, incredible biodiversity, and dolphin sightings.

2. Honaunau Bay (Pāʻeʻa or "Two Step")

A very close second to Kealakekua, Honaunau Bay offers world-class snorkeling with incredibly easy access. Nicknamed "Two Step" for the natural lava rock steps that lead into the water, this spot is beloved by locals and visitors alike. The bay has a shallow, sandy area perfect for beginners and a deep outer section for more advanced snorkelers.

The right (north) side of the bay features intricate coral gardens and sea arches. You're almost guaranteed to see green sea turtles (honu), and the diversity of fish is astounding. The bay is located right next to Puʻuhonua o Hōnaunau National Historical Park, a sacred site that adds to the area's profound beauty.

Access: Drive right up and park (though it can get crowded). Entry is via the smooth lava rock "steps."
Skill Level: All levels. Beginners can stay in the shallow inner bay, while experts can explore the outer reefs.
Best For: Easy access, turtle sightings, and consistently clear water.

3. Kahaluʻu Beach Park

For beginners and families, Kahaluʻu is the perfect place to start. This small, protected bay in Kailua-Kona is sheltered from the open ocean by a submerged breakwater, creating a calm, shallow environment teeming with fish. The fish here are very accustomed to people, allowing for wonderful, close-up encounters.

It's an excellent place to see yellow tang, parrotfish, and triggerfish. The Kahaluʻu Bay Education Center has volunteers on-site to teach visitors about reef etiquette and help identify marine life. As noted by the National Park Service, protecting these near-shore habitats is critical for the ecosystem's health.

Access: Large parking lot, restrooms, and a lifeguard on duty. It's very accessible.
Skill Level: Beginner. The water is rarely more than waist-deep in the main snorkeling area.
Best For: Families with young children, first-time snorkelers, and learning fish identification.

Best Snorkeling on the Kohala Coast

The sunny Kohala Coast is known for its luxury resorts and stunning white-sand beaches. While the snorkeling might not be quite as dramatic as South Kona's, several spots offer beautiful underwater experiences in a resort setting.

4. Waialea Bay (Beach 69)

Locally known as "Beach 69" (for the number on a nearby utility pole), Waialea Bay is a local favorite. It features a mix of white sand and rocky outcroppings, with gnarled kiawe trees providing ample shade. The snorkeling is best around the rocky points that separate the bay's small coves. The underwater terrain is varied, with lots of nooks and crannies for fish and turtles to hide.

Access: Paved parking lot with a small entrance fee, restrooms, and showers.
Skill Level: Beginner to intermediate. Conditions are usually calm, especially in the morning.
Best For: A relaxed beach day combining good snorkeling with shade and sand.

5. Mauna Kea Beach (Kaunaʻoa Bay)

Often ranked as one of the world's best beaches, Mauna Kea Beach is a perfect crescent of white sand with incredibly clear, turquoise water. While primarily a swimming beach, the rocky outcrop on the right (north) side of the bay offers excellent snorkeling. The reef here is healthy and home to a good variety of fish. You may even spot a harmless manta ray at night, as they are attracted to the lights from the Mauna Kea Beach Hotel.

Access: Public access is limited. There are only about 30 public parking spots, which fill up very early in the morning (before 9 am). Arrive early and get a pass from the guard gate at the Mauna Kea Beach Hotel entrance.
Skill Level: Intermediate. Can be exposed to swell, so go only when the water is calm.
Best For: Postcard-perfect scenery and good reef snorkeling if you can get parking.

Snorkeling Safety and Reef Etiquette

The ocean in Hawaiʻi is powerful and must be respected. Always prioritize safety.

Check Conditions: Always check the surf report before you go. If there are waves, visibility will be poor and dangerous currents can form. When in doubt, don't go out.
Never Snorkel Alone: Use the buddy system.
Know Your Limits: Don't go out further than you can comfortably swim back.
Use Sun Protection: The Hawaiian sun is intense. Wear a rash guard or a t-shirt and apply reef-safe sunscreen.
Watch Your Entry/Exit: Be careful when entering and exiting over lava rock, which can be sharp and slippery.

Protecting Hawaiʻi's fragile marine ecosystem is a shared responsibility (kuleana).

Don't Touch Anything: Coral is a living animal and can be killed by a simple touch. Never stand on or touch the reef.
Use Reef-Safe Sunscreen: Hawaiʻi has banned the sale of sunscreens containing oxybenzone and octinoxate. According to the State of Hawaiʻi, these chemicals are highly toxic to coral. Look for mineral-based sunscreens with zinc oxide or titanium dioxide.
Keep Your Distance: Observe marine life from a respectful distance. It is illegal to touch or harass sea turtles, dolphins, and monk seals.
Leave No Trace: Pack out everything you bring in.

For travelers seeking a more curated experience, many of the island's best snorkeling sites can be accessed via high-end private charters, which you can learn more about at highendhawaii.com.

Frequently asked questions

What is the absolute best place to snorkel on the Big Island?

For pure underwater quality, Kealakekua Bay (Captain Cook) is unrivaled due to its protected status and vibrant reef. However, for the best combination of quality and easy access, Honaunau Bay (Two Step) is the top choice for most visitors.

Can you snorkel with manta rays on the Big Island?

Yes, but it's a very specific activity. Manta ray encounters are done at night on supervised boat tours. Snorkelers hold onto a floating light board that attracts plankton, which in turn attracts the mantas to feed. It is not something you do during a regular day of snorkeling.

Is the snorkeling better in Kona or Hilo?

The snorkeling is significantly better on the Kona (west) side of the island. The water is much calmer and clearer, and the coral reefs are more extensive and healthier. The Hilo side is generally too rough and murky from freshwater runoff for good snorkeling.

Do I need a boat to access good snorkeling spots?

No, you don't. Excellent spots like Honaunau Bay and Kahaluʻu Beach Park are accessible from the shore. However, the island's premier spot, Kealakekua Bay, is best accessed via a boat tour or a permitted kayak.

What time of day is best for snorkeling?

The morning is almost always the best time to snorkel. The ocean is typically at its calmest, visibility is at its peak, and popular spots are less crowded. The wind often picks up in the afternoon, which can create chop and reduce visibility.

What is 'reef-safe' sunscreen?

Reef-safe sunscreen is a product that does not contain oxybenzone and octinoxate, two chemicals that are toxic to coral reefs and banned for sale in Hawaiʻi. To protect the reef, choose mineral-based sunscreens with active ingredients like zinc oxide or titanium dioxide.

Do I need to worry about sharks while snorkeling?

Shark encounters while snorkeling are extremely rare on the Big Island. The small reef sharks that inhabit the waters are generally shy and not a threat to humans. By avoiding snorkeling at dawn or dusk and in murky water, you further minimize an already tiny risk.